Have you ever read “Children of the Lamp”? I’m really, REALLY new to pokemon, so perhaps there’s something in the anime that I’ve missed, rendering this impossible, but I’ve always thought the inside of pokeballs similar to the inside of the lamps in those series; larger on the inside, with the pokemon having the ability to modify the inside to their liking. Pokemon go in, see it’s comfortable, and like the trainer’s willingness to accommodate them, and end up appreciating the trainer a lot more
I’m afraid I’m not familiar with that series. It’s sort of fine in theory, but official sources are always very cagey with how Pokémon experience the inside of a Pokéball. The image below, with Iris’ Dragonite, is the closest thing I’m aware of to an actual depiction of what it’s like (though note that, if it looks grumpy, that’s not necessarily because of conditions inside the Pokéball – “grumpy” is this particular Dragonite’s baseline). I think originally Pokéballs were imagined to store Pokémon as data in a similar way to the PC network, but then the anime did things that made it clear they were still aware while inside, and could leave at will. Probably several people at Game Freak have thought something along the lines of what you’re talking about at one time or another, but I’m not sure anyone has ever gone through to see whether it’s consistent with how Pokéballs are portrayed and how they work throughout the series.