Yeah, phinny is fun, but is feels so different from p99/classic. I'm a sucker for classic graphics and classic spell effects. I would have a mini-seizure whenever I would cast root on phinny and see the unbelievably bad spell graphic. (and yes, I know ice comet looks badass, that spell is the only exception). Or when I would see some guy on some stupid ass worg mount that he bought for 15 bucks. Or how about zoning into new freeport? I guess I just can't handle the horrible aesthetic changes to the game.
Additionally, as much as I hate the neckbeards and poopsockers on p99, the stay at home moms on phinny drive me nuts. My charmed pet in the group would break, I would immediately re-mez, then a stay at home mom would nuke it and I would get dropped in a second. She would then go afk to deal with her dogs for 20 minutes, not even realizing that she got me killed.
Lastly, the group experience bonus on phinny, while nice, discourages solo play. With group experience bonus being the way it is, there is absolutely no reason to solo. Sometimes I want to just sit down and kill some shit every few minutes as I take care of some things in real life. I love quad-kiting, the bard diet and camping.
That's my personal reasons why I have enjoyed P99 and am enjoying TAKP a lot more than phinny.