I don't think DSP really runs into that many bugs, or even puts the system under too much stress. He thinks he's the king of bugs because claiming a game is buggy is one of his go to excuses. In reality the "bug" is that he's just playing badly or doesn't understand basic gameplay mechanics. But rarely, is the game actually behaving incorrectly.
I think Phil actually does enjoy RPGs, just a select genre, and not for the usual reasons people like RPGs. Phil seems to enjoy grindier RPGs, with lots of random encounters. Even for someone like Phil who is awful at games, most random encounters present no threat to you. You just click attack and win over and over. Phil absolutely loves winning. You're also rewarded too, since the more you grind and win, the more powerful you become overall. And it also allows you to brute force through harder fights that actually require strategy, since if you grind enough, you can win just by clicking attack over and over. From a streaming standpoint, those games are also easier to stall for time/milk donations.
But the actual RPG elements people usually enjoy, like complex combat systems or the story or whatever? Phil hates those. I also think that's one of the reasons why Phil will claim to like older RPGs. There are certainly still grindier RPGs, but it feels like the genre has moved away from that, either going more of an action route, or focusing less on lots of insignificant random encounters and diving into more meaningful strategic battles, where you're always expected to be utilizing all your character skills/items or going down an advanced build path.