490? Dang kinda slow. Faster than the meteor, slower than the 262.
Poor workmanship, 490 is actually being gentle, the He 162 was not ordered over 311mph due to poor construction since March 1945. Any speeds higher, would result in a massive failure of the air frame and the loss of an aircraft. In another words - Slave Labor and time consuming construction, in another words - you build as many as we say or you eat a bullet - many of the aircrafts were built without any testing or standards.
Its bad enough the Tiger II we have in aces high is a perfect tank, In reality a handful were - however the majority were plagued with poor craftmanship and were no where near the quality standards early german equipment were being tested on.
The HE-162 was far worse - the war was "lost" - I./JG-1 was the operational unit of the He-162, however they spent more time moving then actually flying.
They were ordered NOT to engage in combat, however on its first operational sortie (attacking an allied airfield) the only HE-162 was shot down by AAA.
The HE-162 served in combat, and in squadron strength, in my opinion you can't compare it to the Me-262 - poor construction, poor pilots - lack of fuel are just examples of trying to compare apples to oranges. Think of the Me-163 we have in aces high, more 163s were lost sitting on the runway then actually in combat.
There is no comparison to the Meteor, it never flew against an enemy aircraft - one can only debate on what "would" of happen, rather then what did.