The ones that didn't (like the DSi/DS Lite, that sort of thing) came out shortly after the prior console and were clearly not meant to replace them--most people only had one iteration of the Nintendo DS.
Actually I was thinking about the entirety of the DS family tree (spanning from DS to 3DS) and to me it did feel like they were replacing the old-gen DS with new-gen 2/3DS. Like Pokemon, you can't play SM/USUM on the standard DS, you'd need the newer gen DS. It's why I have both a regular DS and a 3DS. Of course, you didn't need to buy all iterations of the DS family, but somewhere in between they definitely made newer games incompatible to older DS consoles to make way for the 2/3DS era.
Anyway my opinion of it UHH I'm not particularly excited about new consoles in general, all I really want is new games, so I'm not going to buy this one immediately. Took me 3 years since release to buy a Switch as I felt I wasn't missing out on anything prior to ACNH. Right now the only teased game was MK which I'm not particularly excited about so I'll definitely wait. Plus I know it is gonna be expensive so I'll need to save up. (Gone are the days when I was a child with a free pass to any single gift for Christmas lol)
As for the naming, I'm not too bothered by it idk. This is just a new-gen Switch so I don't see how else they should've named it. NEW Nintendo Switch? I guess? I don't recall all consoles but the ones I remember were GBC -> GBA, Nintendo DS -> 2/3DS, Wii -> Wii U (which I have read was a mistake in naming lol). I mean even the playstation just names their consoles PS1 2 3 4 5 and people understand it so I'm not too phased.
The one problem I have is that now it's bigger, so like..... heavier? Bulkier? I know the 3DS was also way bigger but since you could fold it, it was still compact enough. The NSW was already kinda a pain to bring around for me because it was so long, and now it's longer
Oh well. Minor issue.
Anyway, cool console! I like how they made the joycons black, I kinda hated the red/blue ones because it felt too bright/neon for me. I love the sleek minimalist color of black! Can't wait for the new games, hoping ACNH won't be for a while because I wanna save up. Splatoon most likely won't be for a year or two considering it hasn't been 3 years since Splatoon 3, we just got a DLC last year, splatfests are still happening, and the game is barely dead yet. ACNH and Splatoon are my awaited games so I shall definitely hold for now.