Yeah, the main draw of Ryuutama, for me, is a more equal focus on things outside of combat and characters that aren't professional monster exterminators. I grew up on 2nd ed D&D dungeon-crawling, but also playing a Toreador in Vampire where you'd get into a fight maybe every other session and then, often because you screwed up. My perfect game session is 1/3 combat, 1/3 roleplaying and 1/3 discovery/exploration and I want a system to support that. If nothing else, I'm always on the lookout for stuff I can mine for ideas in a d20 game.
On Pathfinder, I do like it and think it improves on 3.x in a lot of ways, but it's still built on 3.x's core and has a lot of the same issues. Mainly, 3.x was a candy store of character abilities where you could go in blind and pick out a bunch of candies and be happy with that, but if you had a character in mind, you just weren't going to find all the right candies to suit that character. Pathfinder offers you a much larger candy store with better flavors, it can be more satisfying, but it's also tougher to navigate the store and still doesn't give a player any access to custom candies. GMs who aren't the best at improvising or like to do everything by the book and shy away from asspulls run into the same problem.
I really didn't have any more trouble prepping or running the engine than any other 3.x game, but I didn't do one-on-one character creation with my last group like I usually do and half of them were new to tabletop games, so they really just weren't creating very solid characters. As a result, they were going into the sessions with zero motivation while I'm a very sandboxy GM, so we just kept running around, aimlessly, while the game kept throwing new junk at us left and right. We also had a really toxic powergamer/rules lawyer that was putting pressure on everyone and just making the game not fun. It devolved into the party traveling around, looking for a monte haul loot game that I just wasn't running. The source of the problems wasn't Pathfinder, it was just the group and my inability to fix it.