is that a lot of romance isekai are actually primarily about the power fantasy of being able to be a child again and have supportive family members who care about you and like

that's the whole thing, and maybe you're also a wizard or whatever but that's secondary

i like those, too

what you don't see a lot of are stories where both the parent and the child have been reincarnated/isekai'd/time-looped/etc. Definitely room for some fun genre-bending stories there. I think The Villainess Flips the Script might be one?

and its REAL good for it. KINDA SPOILERS BELOW

They even reincarnate at different times, the main characters mum and dad reincarnate as kids first and live whole lives together first. Then her older brother gets born, so her whole family know and are just waiting for her to remember her past life too - its real neat and implemented in an interesting way. I recommended the audiobooks if you like listening to fluff light novels like i do