I mean, if it does, but I see it more as venting and comfort food for the people already here. I don't think these sites have much capacity to directly change things, at most to be a support role for you (generic you) to change things in your life and society you can reach at a local level, so I see this as "hey if you're stressing about the world here's some cute catgirls with some injokes you get and also they're being lewd sometimes".
I accept the inherent risks in flying a 4th international flag if it'll keep people thinking whether I mean posadas or trot
Well first and foremost working only with mouse won't get you that far, most modern programs are expecting pressure. That said, using a low opacity simple round brush can work for this, study something like how the Street Fighter III art was coloured.
There's no big tutorials needed for cel-shading, I mean simply being able to drastically go "this part is shade, this part is not shade", since it keeps you understanding the volumes. smudging etc, I feel, is only useful once you've got a good grasp of the tridimentional figure you're painting, so you can go "well in this surface the shadow would be a soft gradient, on this one a hard edge" etc. Dunno.
Most important is have fun. You're gonna have to stick with this for a few years so if you're doing it out of obligation it'll go nowhere.