They run much leaner and leaner equals hotter.
I have been running the snot out of a Redmax 8000 blower since the early 2000's and its never missed a beat. However, it doesn't have a compensating carb like the newer saws have. FWIW it's been on a diet of 32:1 since day one.
They do not run leaner at all. You (or the feedback system) tune them so that they are the same fuel/air ratio as any other saw. In terms of fuel/air ratio the mix that passes through the case is much, much richer than a non strato saw, although I can't see why that matters. The rich fuel/air mix arrives much later and mixes with the fresh air that is already there to yeild a mix that is adjusted to be correct. The difference is that there is much less unburned fuel blowing out the exhaust - fuel that costs you money, makes no power and damages your health when you breathe it.
There are a lot of misconceptions about how strato saws work that contribute to these concerns. I run mine on 40:1.
Corporate use of its size to crush competition by lobbying regulators for rules that favor it's technology in the name of saving the earf. Your days of field repairing your saw are soon over. Thanks world.
I'm no fan of big corporations, but this is absurd. The emissions limits came first, and various manufacturers tried various approaches to meet them.
McCulloch tried whining, crying and lobbying, and when that didn't work they admitted that they had invested all their money in other things than product development, so they sold their name and when out of business.
Most did the cheapest thing and set the carbs lean, stuck limiters on the adjusters and shove a cat in the muffler. Including Husqvarna, although they apparently were working on a form of strato too.
Some smaller companies (Zenoah) actually invested in developing engine technologies to address the most basic problem of scavenging losses, and succeeded in a major breakthrough that requires no additional moving parts. But they were small and could not capture enough market share so they sold their business to Husqvarna - still, Husqvarna made an investment. Further, they invested in developing feedback carbs to address the other main culprit of puking raw fuel out the exhaust, which are the carbs that cannot hold a fixed fuel air ratio with varying rpm.
As for repairing saws, maybe that applies to you but I'll still be working on my tools. I've ported my strato saws while preserving the strato function, and the feedback carb systems are pathetically simple.