Depends on what "SB" you're talking about.
For Stormblood?
I was one of those who was very upset/vocal about the removal of Sustain,which prevented Titan-Egi from tanking as well as it used to (Physick not scaling to INT like RDM's Vercure certainly didn't help either).
Thus, I was glad that they brought it back shortly after.
For Shadowbringers?
On the one hand, I was kind of disappointed that Titan-Egi no longer had the tank role (now having a "support" role through its Earthen Armor).
At least at first, since I ended up getting used to it in the end.
But on the other hand, I really like that Egis can no longer be targeted/damaged/killed, as well as being able to instantly summon them at no MP cost.
So yeah...