That makes a good bit of sense, yeah.
I don't have many high/max equip slot golds and two of them have Taunt as a personal skill so they either end up as glass cannons (equipped with primarily performance gear) or they can take hits but don't have instant machine-mulching power (equipped with primarily HP and/or defense gear).If you're still having trouble with event stages and the second tower, that seems like a setup issue. Are you using low skill-level/low equip-slot rainbows instead of max level golds? Not spamming the performance buff melodies nor stacking performance equipment on anyone?
That aside, I'm using a gold performance boosting melody and also performance-boosting equipment where I can but I'm slightly hamstrung because most of the good performance equipment I have is either *** rarity or red type. If I farm the second tower I'll eventually have enough performance-boosting equipment to distribute to my best characters though, even if most of them won't get a 1.5x bonus from being the same type as the equipment.