I have to say Hyper Training is one of the best things to happen so far to these new games.
I was very involved with breeding/catching competitive Pokemon during the 4th generation before RNG manipulation was a thing. Back then, breeding was difficult, soft resetting was very time consuming, and usually neither ever resulted in anything perfect unless you were a lucky breeder. Thus there was a lot of exclusivity when it came to superbly IVed Pokemon. It was an interesting and fun time to be involved in the Pokemon community, but when RNG manipulation became accessible, it made me realize that obsessing over the best Pokemon kind of sapped the fun out of playing the game - partly because of how much time had to be spent on repetitive acts like breeding and soft resetting, and partly because of how discardable inferior Pokemon were.
The reason I’m excited about Hyper Training is because I think it finally brings me back to the days where I didn’t have to worry about ‘good’ my Pokemon was and whether it was going to be worthless later on. Obviously natures/abilities still have to be considered (probably), but now the majority of the time can be spent on actually raising your Pokemon, and I think that’s one of the funnest parts of the series for me. In the last generation I was so adamant on my in-game team being relevant after I beat the game that I competitively bred the entirety of the teams for Y/AS, but I’m glad I don’t have to obsessively pander over that in the upcoming games. I think Hyper Training will help everyone focus more on actually playing the games and maybe get more people involved with sorts of competitive battling within the game!