I haven't seen very detailed play analysis anywhere, except maybe on a handful of plays. Something like the Do Your Job NFL video on the SB 49 interception, but for every (or at least many) plays. Basically, for each play, I'd like to see:
(1) a diagram and name
(2) presnap adjustments
(3) why the play was called
(4) similar plays by the team, and by the league, or if the play is new, why it is new
(5) any specific adjustments players on offense and defense made, both presnap and during play
(6) any audibles affecting the play
(7) any unusually great performances that made the play work or not, or any mistakes players made.
(8) what each player is doing on the play, and why, and how well.
Belichick's Breakdowns is the only place I've seen that has some of this. But it's still very superficial. For instance, Belichick might point out a good block, but he won't describe exactly what techniques the blocker used, or what techniques the rusher used to evade them. And Belichick rarely describes in detail the strategy or history of a particular play either. Obviously Belichick and the players know much more information about a play, and what he shares is extremely interesting, but he's still not saying that much.
I assume that coaches around the league have and use all this information, but it's not available to fans. Bedard's Super Bowl analysis that was cited here as an example of this reporter's great analysis is superficial. It has half a sentence about that Hogan catch at the end of regulation, when even here it's been discussed in much more detail (with still many unanswered questions). And it doesn't say anything about many other plays.
If a site wants to breakdown in detail, say, the top 20 plays after a Patriots game - take my money! But the kind of simplistic, highly superficial analyses - "he played well! he played badly! great effort! out route! good blocking! missed a block!" that I typically see leave too many unanswered questions.
By the way, everyone here always says how Belichick plays chess etc. In chess, when players make a move, commentators and analysts will in fact explain what each piece is doing, a lot of detailed information on the reasons for things, typically based on computer analysis; similar positions; and, in the opening, how this fits into a player's repertoire, into the known lines, and if it is new. Kasparov used to write a chapter on why someone would play ...Re8 not ...Rd8 in the Scheveningen. But it's rare to see detailed analysis in football.