I think is a great tool and pixi might be good tool too. you can transform much of the old sprites from this tool with floating much app just copy and paste the code of your sprite here: https://floating.muncher.se/trashkas.php
To make compatible with pixi copy the code from your sprite asm file paste in that app click on send and copy the new code and paste to your asm file
It'll get deleted as soon as we've set everything up for PIXI to be the new standard.
As of now it's not, because a lot of sprites are still made for TRASM and forcing people to use a tool that can't even insert all sprites yet wouldn't be right.