We are now in the 5th version of FFXIV and gear has more or less stayed the same. My suggestion is what we have some more interesting special effects or set bonuses on weapons and gear.
Getting a new gear set each raid tier doesn't really change the gameplay of how the game plays very much but with special effects and set bonuses on gear it adds more flavor to gear and makes the game fun to play i think.
For example in FFXI you would gain a new weapon skill when you equipped a relic weapon. For FFXIV you could have weapons when you equip them give you a new skill or ability. It could also give you a special effect like double or triple auto attacks for example.
Set bonuses are also fun. There were some early on in FFXIV but they went away. This can reward people for collecting pieces from the same gear set even if they didn't say have the best sub stats the set bonus could make up for it. Say like if you had warrior their set bonus could be double attack, if you had 2 pieces of gear you could get 5% chance for weapon skills to do double damage but if you had 5 pieces of the gear set then you could have 25% double attack.
Different gear sets could have different effects. Like for a tank for example there could be a set that occasionally nulls damage taken based on how many pieces you had equipped. But you could choose to have an offensive set bonus that had a haste effect that would proc and lower your gcd by a lot.