Haha okay you're gonna get my whole thing. Though keep in mind we do have gamepad support and are gonna add wasd as an option. People have convinced me that it's necessary.
1. Not everyone plays a lot of fps. People who primarily do retro gaming actually don't use wasd very much.
2. 2d platforming is usually different than 3d and requires more frequent and precise left/right/jump movements (often requiring all three in quick succession). Assigning moving and jumping to different hands improves accuracy for these movements, especially when you consider 90% of the population is right-handed. Does it really make sense to load up the non-dominant hand with three or four jobs at once (e.g. in games that have a weapon and dash or something, you need to move, jump, fire, and dash all with the same hand)? I even have left-handed friends who play a lot of precision platformers who prefer zx+arrows precisely bc it separates movement from jumping and improves accuracy.
So in sum, my personal opinion is wasd is less well suited for 2d precision platforming, and although it makes sense to include it as an option bc so many people are trained on fps games, zx+arrows is a better option for demanding 2d platforming.