i'm sorry to say that you are misinformed.
no you do not have to be level 75, you just have to farm.
to sum it up, you don't want to farm, so you want it easy? 'hey devs give us similar bonuses to that of galaxia and elga rare sets so i don't get owned in bsq' i must be the odd man out to think that a level 50 should have virtually no hope in beating someone 20-30+ levels above them. and if you do, well, lucky you.
i'm not going to avoid elaborating on the issue to the same old group of whiners.
Actually he's correct on some parts. Well mostly at endgame vs endgame. Where we have proof of resistance working somewhat properly.
Yes, you have to be level 75+. But not overall in resistances to 100% counter elements in general. But to counter the issues of element elga's with either high star attack sockets or accessories using +20 weapons. He means through +20 Element Elga+Accessories, or +20 Zauharant w/ Accessories. Both of which always yield high element attack values. However there's no confirmation on how we can do in level 70 vs 70. Where max element damage is through zauha+accessories and sockets. Or 50 vs 50, or 60 vs 60. Yet I see no one in these level ranges attempting the resistance values needed to deal with the element users in those level ranges. Why? Because no one knows if it'll even be worth it. At those levels, the socket values of elements are in the underwhelming values. Attack and resistance until 4-5* and even then those aren't much compared to the next tier's sockets. 71-80 and 81-90 Sockets have the best values.
Farming is required but it's required to an immense extreme. 4-stars are the value they're measuring because it's the lesser of the extreme farming requirements. 5-stars are mostly through lucky unboxes or trade-ins and 6-stars are pure luck and at a drop rate too low for majority of the server to bother or where people do extreme hardcore farming runs for and have little to no results.
Elements has no confirmed Resistance vs Attack ratios. Only trial and error results through test duels against the people who manage to hit these numbers combined with 20k+ defense. And even then the results reach no confirmed ratio or %-value dropped. Only an estimated flat-number value drop or %-damage reduced compared to a 0-resist value of the same defense.
The developers know (At least we assume) that just removing elements will not fix anything, a reworking of the system and releasing of accurate values of Resistance vs Attack would help, but would likely be outside the range of what Gravity Interactive will do.
And you're thinking of a situation which is almost impossible through perma-capped stacked players. Possibly including any Perma-capped characters you own. A stacked level 50 can fight a level 70. Hell some older, no longer playing, perm 50's have been able to hold against level 75+. I've seen Perma-capped 60's hold against level 80s. Players can stack their level 50s to extremes where a 20-level gap will almost just be a slight bother.
This is just a situation we, including yourself, have no 100% accurate knowledge of. Even frequent and extreme value Element Resistance value users don't have full knowledge of it.