You're exactly right.
Also, people tend to see everything in black or white, right or wrong. When it comes to building performance engines there is no one size fits all approach.
Will raising the exhaust make power at a higher rpm? Not always.
Will more blowdown help performance? Sometimes.
Does the muffler need bigger outlets? Not in every case....
If I toss out a set of numbers will they help you port your saw better? I doubt it.
There are so many variables in not only the architecture of the engines, but in a user's ability to file a chain that matches the powerband of the engine.
If anyone is interested in details. Send me a message. I'm happy to share my spec sheets with anyone.....in private.