I really agree with RPGs being hard to make due to all the systems you need to account for, even if those systems are generally not used that much in the final game.
I was very stressed about my game just completely falling apart in some way I hadn't accounted for on stream, thankfully everything held up for the most part, I already have ideas on what I could do to improve the existing systems and additional content but ultimately I think I'll leave it as is and take a break from making games in my free time for a while. Next jam I take part in I'll either work with a group or do something a lot smaller in scope.
As for presets, I think it makes the jam a lot more inclusive to let people use assets packs/system presets as long as the developer is very transparent on what is theirs and what isn't, it also makes what others made from scratch/themselves more impressive in comparison.