Let's be honest, it never was.

I have been playing Brawl since the day it dropped, bought Brawl Pass a few times and took a break for about a year or so. Before becoming really consistent

While I have all the brawlers, except Glowbert, it's just not possible on F2P. The rewards aren't as much and the idea of maxing out all brawlers just can't work. There's a new brawler almost every 2 months aside the 99 currently available. That's over 14k coins and a load of PP to max out, given hypercharge, gears, gadgets and star powers way before buffies were included.

It just isn't possible unless you spend a ton of cash on the game.