He'll do that. Though as a general rule of thumb, if it appears the Master has died, the Master has not in fact died. The Master's come back from being burnt to death. At this point, cheating death is kind of one of the things they do more or less.
Moffat tries too hard to make his plot looks clever, and the plots suffer because of that. He seems to equate good plot with complex plot, which is not always the case. Not to mention his episodes with more complex plots are his worst ones. Doctor Dances, it's just nanotechnobabblemachines that are the reason. Enough to satisfy. Girl in the Fireplace, simple. Blink, simple concept: statues can move! Library: The shadows eat you!
And then you have stuff like the Pandorica and the entirety of series 6, which he tried to make so complex it ended up being nothing but terrible episode after terrible episode. The Doctor dies! Companion pregnant! Stuff happens, mostly terrible episodes. Then AGMGTW, which was terrible. A bunch of people we have never seen before are called by the Doctor to help (they could have at least actually put them in the three episodes between DotM and AGMGTW, then it would be far more forgivable) and suddenly, travelling in the time vortex makes babies part time lord for... a reason that is NEVER, EVER EXPLAINED. Then you have an utterly needless break in the series, completely ruining the pace. Suddenly you have "Let's Kill Hitler", which is IMO the worst episode in the revived series by far. Literally sounds like the title was thought up one day and that he tried to shoehorn a plot into it. Then we have Amy's childhood friend, who we never saw before despite seeing the place she grew up in The Eleventh Hour, who turns out to be Melody despite having the most obvious name imaginable that didn't even try to hide it. Never mind the implication that Melody already somehow knew her parents were Amy and Rory which is NEVER, EVER EXPLAINED. Also somehow getting across from the USA to a small village in England.. as a child. Which is ridiculously implausible. Nobody would allow a lone child to get that far. Then of course there's the Tesselecta thing, along side the whole dying Doctor... the episode has far too much going on at once. Then there's a bunch of more forgettable episodes, which can all be summarised with 'in the end the Doctor saved the day with the power of love'. Then there's that abhorrent wedding episode with the alternate timeline that makes absolutely no sense whatsoever, they're not even coy about hiding the fact they never explain what's going on in it. It is more or less the biggest offender when it comes to 'the day is saved by the power of love' because if I recall, the time problem is solved with a kiss. Then the Doctor survives, and people were somehow shocked despite him being the titular character. (it'd be like if any show named after its titular character had its titular character die) Sorry. I just really hate the sixth series.
The problem with most writers and actors of the show is that they're fans. They pour their heart into it but because they like it so much, they can't see the flaws. What do Moffat, Davies, Tennant, and Capaldi have in common? They were all fans of the show when they were younger. (This is, IMO, why fanfiction is often terrible as well.) It is therefore no surprise that Jamie Mathieson's episodes of series 8 were some of the best received ones: as far as we know, he wasn't a fan of the show.
And of course, saying that plus the stuff I already about his complex episodes being the worst ones, I am very apprehensive about series 9 for one reason: I can already tell it is far too ambitious for its own good.
Just look at the so-far revealed episode titles:
9x01: The Magician's Apprentice
9x02: The Witch's Familiar (this and the above both written by Moffat)
9x05: The Girl Who Died (written by Moffat and Mathieson, will be very interesting to see how this one turns out)
9x06: The Woman Who Lived (written by Catherine Tregenna)
You can probably already tell what he appears to be trying to do. On the bright side: we appear to be getting a lot more two-parters, which may alleviate some problems with the plots. There is speculation that the entire series is made up of nothing but two-parters. It's like an overdue payment for the lack of them since series 6. It would seem the first six episodes are two-parters, at least. Toby Whithouse is writing episodes 3 and 4 and they've been confirmed to be two parts, the opener is a two-parter and episodes 5 and 6 have similar titles and are both directed by Ed Bazalgette, implying they're also a two-parter. Beyond that, I think episode titles and directors have yet to be confirmed. If we have thirteen episodes instead of 12 episodes like series 8, we may even have a three-parter. Ambitious, if so. I wouldn't object to seeing a four-parter one day, either.
For the record, I like Moffat for the most part. I just hate series 6, the way he tries to make his plots overly complex, and am of the opinion that it shouldn't be one person showrunning the, well, show. Should be multiple people. It'd be more consistent that way, I think.