In an age of bloated art files, I love how small Flash files can be. This guy for example, weighing in at 355 kb. https://twitter.com/bobjinx/status/1360767120615866369

This guy was 79 kb before I added texture in photoshop (aka, bloato-phop) https://twitter.com/bobjinx/status/1370910277097693187

652 kb (that's 0.6 mb) https://twitter.com/bobjinx/status/1367332152078184448

Am I crazy to color in Flash? Maybe.
Does it work for me? Sometimes! (I color in PS too)
I like the ease of color filling, as I'm using flats anyway. Plus, VECTOR!

Anyway, Flash still does the trick for me.

I will note that I'm often drawing in Toonboom these days and (throw stuff at me) importing the art into Flash to color.
Why not color in Toonboom? No reason, I'm just 20 years in to Flash and it's more comfortable.