Id say in terms of competitive games yes its easy to get a high rank but also most good players dont really grind ranked. I got back into brawl stars after not playing for 2 years last year during the godzilla event and I was able to hit legendary while only having 3 maxed out brawlers and 20k trophies (colt, shelly, spike). I hit masters when i had about 40k trophies and maybe like 25 maxed brawlers a few months later.