Ya gotta start somewhere. I wish there was more to be seen of any of your attempts (beyond Beneath the Waterfall) of a non-linear level because it's difficult to give a judgement on this when there's nothing to go off of. It's not like pathfinding-based levels have to be the most complex creations ever either. Marble Playground is a perfect example; it's an incredibly simple level (two sides, two floors each, a couple linear moving platforms, some slopes, some PowerUps), but still a fantastic level to find a path for. You just need to play around a bit with how big and/or complex you want your level to be. The important part is just giving the player the freedom to do basically whatever.
I have never made a pathfinding level (except Beneath the Waterfall tho), simply because I am just unable/can do it.
This seems to be something that was a more common and a lot more appreciated several years ago, probably back to the days of MBP's development and maybe even before that. Levels like TTOTTS, Marble Mosaic, and MPMC all fall under this category, and they were a lot more popular a while back. It just seems like nowadays the "ideal standard" for a "fun" level is one that is easy to play casually and at a fast pace. I'm not quite sure when this shift happened, or why it even happened in the first place. I imagine that a lot of people find enjoyment in both kinds of levels, but we're just so accustomed to immediately trying to beat any level as fast as possible that the fast = better mindset took over hard = better.
You guys seem like you want to see how fast a level can be speedrunned instead of how hard a level can be made and still can be beaten.
You (general) tend to be better at your own levels. You know them inside and out, you're first in line to a lot of the possible tricks and strategies. I personally think the Momentum and Conservation of Momentum are much easier than Medieval Dash for a number of reasons (no moving platforms, almost everything flows very well, not as many chances to have to slow down or stop), but maybe there are some people who think differently.
But in the contrary, they just ragequitted at level 4 of glc4, which imo is WAYY easier than momentum/conservation of momentum.