Not being able to name on non-color Tamagotchi kind of got me; it was part of the appeal as a kid.
On the colors, though... I was kind of happy about that. These are established characters. It might be kind of redundant to have their name there if they are really all that well-known, but it's kind of comforting to me to know that there isn't going to be a personalized history of names. On the P's, the generation count was very much still a thing. Now, with the 4U+, an even less personalized experience, I'm even happier that I get to just play and worry less about creative details and a neat family history on my part.
That's just me, though. I know a big part of the appeal of having a virtual pet is being able to make it your own.