I think Trust Masteries will play a significant role if you are a f2p player that is struggling and unlucky as hell with pulling decent units, like myself, specifically 5* base units. If you do have 5* base unit, I'm sure you can survive without TMs. It actually make sense and IS mandatory to reroll for at at least one 5* if you don't want to worry about grinding for TMs. I've been playing since launch and relied only on my Bartz, CoD, and Exdeath for damage, with no healer with the exception of Cecil's Curaja(Working on Dualcast); I have yet to see any 5* base. I've received about 2-3 rainbows, but they turned out to be Duane, Gafgarion, and Terra. I'm getting close to getting my first dual wield and I think that'll be a huge boost in my damage department. I'm also slowly losing faith in this game, I have done 128 pulls on the Gilgamesh Banner and managed to pull my first Cecil, 95% Faris TM, no Gilgamesh, and a dozen of Exdeaths. I also did about 60 pulls on the Noctis Banner, got nothing but Charlotte for days. Meanwhile my buddies that I persuaded to play a few months ago, and another one recently already have 2 5* base units... the salt is unreal in my veins haha. I'm managing okay though assuming a few of my whale friendlist doesn't delete me off, but I am definitely struggling with these events and trials. I haven't even beaten Antenora yet. All in all, I'd say TMs will make a difference for those in my situation, relying on 3* and 4*. I just wish there was a reward system for veteran players that are consistent.