As you begin to approach the level cap, and you attempt to do Super Hard and higher difficulty content and "End-game" EQ´s, you need to start pulling your own weight, and a successful and profitable run depends on everyone, including you.
The overall difficulty of bosses is not much higher, but they become a bit spongey, so if most of the EQ is severely undergeared, it spells failure.
Now, do not get me wrong, no-one expects you to be wielding a +35 Nemesis with high-end affixes and a fully upgraded, 8 slotted Saiki set to do Super Hard Falz Elder.
But as a bare minimum, attempt to buy a *13 star weapon and a full set of matching *10 units with a set bonus, that you must grind to +10.
If you have been doing lower level UQ´s, you will probably even have enough Unique Badges to get the weapon of your choice absolutely free of charge!
And buying the matching unit set, even with some basic affixes, and upgrading it to +10 may cost you less than 700.000 meseta.
Even with just this basic, bare minimum, skeleton equipment, and assuming you are upgrading your skill trees correctly, you should be able to pull some weight rather than being a detriment.
The amount of people i see in SH UQ´s with lv7 units and a deo weapon, getting killed by literally every mechanic and doing 530 damage on a lv75 Luther (on the very few times they are actually alive) is quite frankly, maddening.
I understand the game does not do a great job at instilling a sense and need for upgrading equipment as up to Very Hard all bosses die within 3 minutes.
But as you raise in level, things change, and you have to contribute.