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Materials and heat is often the reason they use same material in muffler as cylinder, but it does not work as intended, I think. If gasket is ok, screws not over tightened, it works OK.. But I see your point. I think it is better with tin. Must be cheaper if nothing else.

Some years ago I talked to an engineer designing saws at Husqvarna about this and it is even cooling that is the larger problem on saws. Most heat is at one side of cylinder, by exoust and towards the top. This happen to be the place furhest from fan too most often and fins are used to not just...

Dirty fins do more harm then were ever you place muffler as they quickly reduce cooling by 25%. Really dirty, 50%. Had several saws here that caught fire due to oil and dust in fins... It is not uncommon saws are run a bit too hard and get a bit hot. More common than most know. So to cool them...

No, There is a fan that should create the air flow to cool fins and blow out there. So you have a flow of air and posetive air pressure around cylinder. Not much radiant heat unless you run it too hot and turn it off instead of cooling it. Heat from muffler does't affect as the air go thru fins...