I’m aware: I didn’t say they weren’t.
How?
Because I would argue, having spent the last year replaying a lot of Gen 1-3, that the simpler graphics and gameplay make for a straightforward and pretty clear cut experience that doesn’t hinder playing them at all.
But then I did grow up with them.
I thought you were saying that double battles and the physical special split were the main differences between gens 3 and 4.
I'm having a hard time articulating exactly what I find difficult about playing Gen 1 especially, and Gen 2 to a lesser degree. Essentially, the visual fidelity is low enough that they often struggle to be fully legible to me. It's sort of like trying to play the game while looking at it through rippling water. You can read the text, but the font is blocky enough that it feels slow, menus feel cramped, pokemon sprites are sometimes difficult to parse or just downright ugly (though charming in their own way). Now, this is made a lot better with Yellow and GSC because the color allows for more detail with the same resolution, but I don't think the issue is entirely solved until the resolution and color space upgrades that came with the GBA games. I'd be interested though, to know if people who started later than me feel towards Gen 3 how I feel towards Gen 1 and 2.
No, because the eras are separated on what the team was focused on changing: gen 4 marks the end of the era where a game would come in with a new innovation for the battle system, and gen 5 starts the era where we'd keep the battles intact and instead would try to bring in new things to the franchise in other ways.
I think it just makes more sense to group the games by features they have, not things that they change from their predecessors. The beginning of an era is typically marked by change, not by the lack of it. Though I do get your point.
I think you're undermining things a bit here. the physical special split changed how many pokemon played and what moves were good on them even at a casual level. sure, if we're going by just "a kid wouldn't notice this" then its not a big deal, but I know plenty of folks who as kids didnt care for natures, abilities, the special split etc.
I don't think the change was insignificant, I just think that it's much less significant than, say, abilities or held items. Obviously this is anecdotal, but I did care about those as a kid. And from a more objective point of view, those mechanics forced you to understand them. You can't make it through a game unaware of items or abilities. The same can't be said for the physical special split. Abilities and items also mattered outside of battle, whereas the split didn't.
Gen 3 overhauled how Pokémon stats worked to the point they decided to make them incompatible with Gen 2, introduced abilities and natures, and were a large step forward visually. Gen 4 introduced the physical special split and online play (this is a bigger deal than the split imo, but I don't think it really hits its stride til Gen 6). Gen 5 introduces hidden abilites. Gen 6 introduced Megas (marking the beginning of the battle gimmick era) and changed the graphics to 3D, by far the biggest change since Gen 2 to 3. To me it's pretty clear that the transition from gens 2 to 3 and 5 to 6 mark major shifts in the games. 3 to 4 is probably the next biggest, I just don't think that generation is different enough to be its own thing.