3 problems with the Stronghold and how to fix them - Stronghold variants

There are 3 main issues with current strongholds that should be fixed.

• There is no reason to find multiple strongholds. Stronghold variants, similar to bastion remnants, can be added to make finding more strongholds more rewarding. Each type can have unique loot. Which brings me to my next point...
• The chests in strongholds are terrible. For one of the rarest structures, the loot in strongholds is laughably bad. It should be unique and very rewarding. It will also encourage players to actually explore the stronghold beyond libraries and the portal room.
• The generation of strongholds is really plain. It only uses old blocks and it has a couple rooms. If you've seen one stronghold you've seen them all. They also don't look like actual submerged strongholds.
  
  Adding stronghold variants can fix all those problems, but they also need to have new loot tables and possibly new items.