I always thought that was a weird idea from blizzard to destroy their previous content. I think they missed a huge opportunity about having multiple end gear with different set and different bonus.

At the end, the only thing you want is to have all tier 10 piece and everyone is dress the same and the other tier become obsolete.

What would be interesting would be to see people choosing different piece of gear to go with their spec and play style. As an example , affliction lock going for 3 piece of R1 to get the 15% increase dmg on their life drain.

That should be really easy to program (i am a programmer myself). The only think that need to be change is the stats of some mobs (must be like 10 mobs in molten core + all the bosses) Those raid already work well, so changing stat is quite easy.

Look at ICC 25 for mobs and boss stats, and change the stats on the mobs/boss In Molten Core, and change the stat on the gears as well to reflect same item level than ICC.

The idea would not to have stronger gear that would unbalance everything , but having the same level of difficulty than ICC all over those older raid with the item with the exact same item lv. Nobody would miss those old obsolete lv 60 gear, nobody is using them anyway. We would loss all the previous raid from Classic and BC, but i m pretty sure they are all dead anyway.