I'm not sure why this is a topic of discussion. Why wouldn't one prebuff given the opportunity?

Granted, I won't sit around in front of every faceroll dungeon boss Stoneskinning the entire party as SCH if the group is chomping at the bit, but I'll at least toss Adlo on the tank as they run in.

The reason I prebuff at any opportunity is precisely because I am lazy and want to minimize the probability that I might need to pause my opening DPS sequence to heal poor life choices. More shielding = more time that I can heal by spamming Embrace without breaking stance or using stacks for Lustrate.

No, failure to prebuff probably won't kill anyone, but why not use your tools to make everything just a tiny bit easier?