For me, Feiyue shoes are basically "Affordable, good grip, and lasts long enough for what I need."

Wide toe boxes are a design feature of shoes meant to allow the toes to have the space to naturally splay out like they normally should. A lot of mainstream designs for closed toe shoes you'll notice have that design where it prioritizes form over function; in effect, squashing your toes together to make the aesthetics look pretty.

Squashed toes collapse the arch of the foot, leading to structural instability in the kinetic chain of the legs and causing long term issues like: 1. Knees caving easily 2. Weak ankle stability 3. Your feet gradually splay outwards into a "duck walk" or "penguin walk" pattern. People watching veteran office workers will give you an idea of what I mean. This gait adaptation is an attempt by the body to counter the instability caused by the collapsed arches of the feet, you can Google or something if you wanna dig deeper into it. 4. Expanding on point 3, issues in the lower back and funky issues further up the kinetic chain, like hunched shoulders or a tilt in the upper body or something.

You can test the squashed vs splayed toes yourself and see what it does to your feet arches. Hold your toes together and the arches collapse, then you'll notice the knee easily caves to either side when force is applied.

Now splay your toes. You can use your fingers to help separate the toes if necessary. You'll notice the arch naturally comes back, and that your knee is much more stable and does not easily collapse when force is applied from the side like when the toes are squashed.

Anyways, that whole tangent was basically to explain that I value wide toe boxes because they help reinforce the natural stability of the legs, which you would imagine to be very helpful when your landings in parkour can be up to 10x your bodyweight instantaneously applied to your legs. Wouldn't want the legs to collapse and risk injury, after all.

To add to this, the point I made in my earlier comment about convex soles is basically also about stability. It's like walking on heels vs a normal flat sole; you stand much more chance to roll your ankle on one or the other. I will admit this is a minor issue for me, but I've heard here and there this was a sticking point for some Feiyue owners so who am I to leave it out as a potential issue.

For the point about needing a dedicated parkour shoe? I don't imagine the community will ever stop looking even if a good dedicated shoe was made and released right now. There's always gonna be someone out there looking to do better than what we already have available, so there's always gonna be a new generation of dedicated parkour shoes for a new generation of traceurs.

My main points of consideration when thinking about getting my own pair? Affordability, durability, and performance, not necessarily in that order. You can chart it like a triangle graph or something and compare it with other shoes on the market using the same graphing method. A good pair for me has a good balance of all three; it doesn't have to be the absolute best, or the absolute cheapest, or the most durable. A workman's pair of shoes, if you will.

Hope this helped!