Server compromise is one of the threats this help manage. In your "just TLS to the server" scenario, that means all data is now instantly readable to the attacker. When all data is encrypted with keys only known to the client, the attacker first needs to take active measures and wait for everyone to log in, which may be visible to attentive clients (think reproducible builds, or the same way that someone might reverse engineer WhatsApp to see if they really did implement the Signal protocol correctly)

I've also been the victim of an attack where passive interception was feasible but not active interference. Everything they could use my session token for, they did, but my password was client-side hashed and thus the admin panel (access logs showed attempting to reach it) was safe because it required entering the password again

As a last example, I don't know what binary Signal gives me, but it gives me piece of mind that it requires colluding with Google to target someone specific, so they effectively give everyone the same binary and any backdoors are visible to all at the same time. I really like client-side cryptography as compared to the server being one big black box we just have to trust