I don't even understand the people who are condemning D&D for not "going in a bold new direction"... to do so opens it up to attacks of "not being D&D" which proved harmful overall to the brand, .
Though you get around to refuting the above, yourself, later, I'll still waste a moment saying that it's not the game that opens itself up to the accusation, it's just something an accuser with no valid criticisms can always resort to.
And while it's not a new direction, there is a lot of boldness in this game. This is as streamlined as I've ever seen D&D since they added the "A" to it.
It's the initial release. It's got less stuff, sure, so maybe it appears streamlined compared to 3.5/Pathfinder with 14 years of bloat. But, if you look at the actual core of the system, it's just about the same level of complexity as any modern ed (fairly complex, but not as bad as the arbitrary sub-systems of the early days), just shuffled around a bit.
They've come up with many elegant solutions to 3e's issues (adv/dis and concentration, for example) while keeping the "traditional" feel; bold.
Just by addressing 3e issues (that had already been solved), that's a step back, by definition.
Dropping Will/For/Ref and Saving Throws completely makes this drastically more accessible to new players; that's bold.
Maybe if they'd stuck to bounded accuracy and not had proficiency in saves, that'd make sense. But a WIS save is distinct from a WIS check because there's such a thing as proficiency in a save. No net savings in complexity compared to FORT/REF/WILL saves. Compared to FORT/REF/WILL /defense/, though, there's an increase in complexity. One you can see everytime something has to give Advantage to attacks but Disadvantage to saves (or vice versa) to represent one effect.
New and interesting mechanics for spellcasting all around. This is evolutionary, not revolutionary, but that doesn't mean it isn't bold. The pseudo-Vancian system could have been a flop, but I haven't seen a Wizard player who doesn't prefer it yet.
Who wouldn't prefer having combined 3.5 Vancian and Spontaneous casting? I mean, for years we argued over which was better, now the Wizard automatically gets /both/?
Really not that different from when it was introduced in 3.5, just, well, like the wizard, /more/.
Bounded accuracy? They bent the trajectory of the combat system trend in a completely different direction. Bounded accuracy makes the game smoother. But many members of the existing fan-base initially bristled, and some still are because it's not as fine a grained system as 3 or 4e. That took guts to even consider, and more guts to stick with it. There's a lot of boldness in this game.
Bounded accuracy is just the Treadmill turned down to 1. Originally, it was supposed to be no bonus, then 1-3 over 20 levels, then 1-5, finally settled on 2-6. That's not exactly sticking to a bold new idea.