Guilds losing purpose
Before TW and TB, a guild was needed to beat a Raid. The Rancor, AAT, and Sith Triumvirate all needed to be conquered by your guild to progress as a team. Immediate "Go Team! and High 5s all around when you beat one."
Now that raids are pretty much "Don't forget to auto-batle and get your points", guild camaraderie is gone. There's TB but everytime you get close to beating an entire TB, we get a new one. And the best reward is half-way through. Of course there is TW, wins are nice but the rewards aren't rare character shards.
Now that the best rewards are all tied to Legendary Journey and Galactic Conquest, Guilds have little purpose. In order to regain that purpose and perpetuate the game, guilds need to be able to complete objectives for in-game rewards.