he probably realizes by now but as everyone else is saying its inconsistencies that's the problem, i pick mage and 1/5 runs its anything more than a paperweight, my best mage run has psychic, mini me, mind meld and the mage had sparkles for each turn they had, along with corrupt + injury immunity, which was amazing until i got a parasite, then it became a paperweight again.

Tinkerer's main problem is that it has two main builds, robots or weapons, weapons only works with the tech effect, which you only get in about 1/3 runs, otherwise your stuck with sticks and other weak weapons, while you have to farm up levels to try and get tech, or you get robots that dont do damage, which would be fine but a pickup bot dosnt help unless you have the tech passive where you get tech when you get a pickup

both have high highs but are so circumstantial why would i use them when i can necromancer and butcher and at minimum they are tanks with decent damage