The ability to customize the stats is what makes this mode so great. Please keep that.
That being said. As previously mentioned and talked about on discord, there are tons of bugs where moves are not working or counting.
As for the overall experience of career mode, I think the evolution points are way too strict, and it is too much of a grind. When you use a double boost, it feels about right, but could be even more. With no boost, it takes around 100 fights to get you to 1000 points to prestige, and then you only gain 100 extra available points, which would take another 100+ fights for just a couple half stars extra.