Agreed. There is considerable question whether Chamberlain refusing a treaty to Hitler would have avoided the bloodbath of WWII or just started it a year early. In which case he might be remembered as the warmonger who refused reasonable accomodations that might have prevented war.
It’s very seldom remembered that the Sudeten Germans had quite legitimate complaints. The self-determination of the Czechs had been respected, but doing so meant repressing theirs.
The discussion of Munich generally implies, without quite saying so, that if the Allies had stood up to Hitler the results would have been entirely positive. That ain’t necessarily so. Among other things, the Allies were much less well-armed than they were in 1939.
The German Wehrmacht was not ready to take on Czechoslovakia, France and England. The Germans would have got a very bloody nose invading Czechoslovakia. Their border defenses and their excellent army would have wiped out many Wehrmacht divisions. The German generals said as much when they inspected the Czech defenses after France and England betrayed her at Munich. That's a fact.