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If the gear design leans into the game's other design elements, it would resolve it without any issues, too. This is 'solved' and 'easy', having been done in multiple PvE games before now, it's just not often applied to PvP games.
@VmanGman
in short, this just 'isn't how this works' with people who have design experience. I'll give an example and you can tell me what you think the problem with it would be.
Sword A of Green Tier has 4 Enhancement slots. Sword B of Purple Tier has 8.
The crafter can put Attack into all slots, but the more Attack in each slot, the harder it is to get the next one in. This is based on total number, not 'number relative to the weapon'.
So it's equally easy to get an Attack +20 Green Tier sword as it is to get an Attack+20 Accuracy +20 Purple Tier sword, but it's really really hard to get an Attack +40 Purple Tier Sword.
But 'casuals' don't have enough Evasion, let's say, for the Accuracy to be necessary. It's nice, but it helps more in PvE or against other 'hardcore' players. The Accuracy 'doesn't affect the fight much'.
Now you have 'Green sword people' fighting 'Purple sword people' and the overall damage done is similar. This sort of design can't be described simply by things like 'gear power in tiers', so even attempting to paraphrase it, leads to concerns like yours.
But if you ask someone 'how much stronger is Sword B than Sword A', in most games, the answer will be 35% stronger (assuming the semi-standard range of 200-600 accuracy and opposed stat calculations). It's 35% more effective than Sword A in fights against strong or equal enemies, but not when facing 'Casuals'. An Attack +40 Purple Tier Sword would be a 'casual slayer', but would involve a massive investment for a sword that might not hold up in 'even' PvP as well.
tl;dr hardcore players already have time, tend to be number-crunchers, and collect tons of gear. Make them HAVE to do all that to be versatile without giving them as much advantage over 'casuals' unless they're specifically aiming to go out there and kill said casuals as a 'preferred enemy'.