Limited choices to make your character concept

[SqueezeBox]

Because PF2 decided to move all available feats to class feats, it's actually limited character concepts. For instance, no longer can you take Power Attack (which is actually Vital Strike in PF1) unless you are a fighter. I think that they've really made less choices for creating a character concept even though they've made more in-class choices available. Really, they've made the game much more class focused than ever before.

I have a suggestion that could help open up options to all classes that goes away from multiclassing. As a General Feat, let someone take a class feat from any other class at a lower level than your current level. Perhaps 2-4 levels lower. This allows someone who wants to play a blood rager or a warpriest with some arcane abilities without needing to multiclass. Really, you can pick and choose what you really want to be able to do as a character without needing to be restricted to a particular class. Leave multiclassing to get some of the core class abilities that don't come as feats (like sneak attack or channeling energy).

[Castilliano]

PF2 reaches all the way back to 1st ed DnD, which I'd have to say was far more class based. Heck, the original version had Elf as a class.

That hyperbole aside, while I agree with some of your specific points, I think the new Dedication Feat system has opened up tons more options.
When the other multiclass Dedications show up we'll have effectively 144 classes. We'll have the 12 classes, but 11 other possible add-ons to each class. Even if we submit that many of the hybrids are wonky (I don't necessarily agree), that's tons of variety. And then there will be the general archetypes & prestige ones too.
So yes, a lot more abilities are gated through classes, but there's a lot more variety of classes. And the way spell DCs & caster levels scale now, there's a lot less cost to full casters to dabble outside their class.

I also would like one General Feat that let's somebody take one feat from another class, with some limitation tied to level(s).