Not sure how this will play out. Before in PF1 you could multiclass and take an archetype at the same time. There are even some builds where you level dip in a class with an archetype/s and have your core class with its own archetype/s. Now it looks like you can't do both. With the way dedication works, you would need to be at level 12. Multiclass feats at 2,4, and 6 and Archetypes at 8, 10, and 12 at minimum unless I am mistaking something. This route would lock you out of many class feats. I know this is a rare build but I feel like PF1 does it better. Again, in PF1 multiclassing really hurt spell casters and their progression but there were ways to fight that. i.e. Magical Knack. Some Prestige classes also helped out the loss of progression. Overall this feels reminiscent of the Variant Multiclassing and I don't think many people used it. I mean the problems of multiclassing I think brought in the rise of Hybrid classes. Merge classes people would like to use together and give them the tools they need to succeed. Like the Magus, Slayer, Hunter, Skald, etc, etc. There are even archetypes that borrow features from other classes to their class. Do you like guns? I can name a few classes with archetypes that let them have a taste of guns.
@Mark, so what is the main difference between archetype feats and multiclass feats? In my mind they are chained feats that you take at even levels instead of your normal class feats. They are mechanically the same. Take this intro feat then its followup feats instead of class feats to get cool "side grades". As mentioned before, you could possible take multiple classes AND archetypes at the same time in PF1. Now you can only do one at a time, minimum 6 levels. Is this intended? That means with 20 levels, you could only get a possible mix of 4 unique Multiclasses/Archetypes. Why even call them Archetype feats and Multiclass feats? Might as well call them a unifying name due to the Dedication clause. UNLESS there is a difference between archetype dedication and multiclass dedication? Are archetypes and multiclass feats even equal in power/usability compared to each other and the default class feats?