Agreed that the use matters. And homeowner vs professional are completely different in terms of hours and stress on the machine.
So if a professional uses Stihl Ultra at 50:1 (high hours, high stress), shouldn't they see excess residue, carbon, and/or mechanical failure?
Where are these stories? Why haven't there been lawsuits? Recalls?
The answer is simple. Because they don't exist in any kind of number.
The problem with the internet is people hear a story about a thing and it immediately becomes the whole truth because "I heard from Joe that Stihl Ultra sucks" even though they were never told that Joe was running it 32:1 in a ported saw.