Exactly. In my book America’s Victories I found that it was the volunteer force that has been the strength of the military over time. Draftee armies are less motivated and less focused. Sometimes you need the bodies (Civil War and WW II) but most of the time there are plenty of excellent volunteers.
The WWII Army was 93% draftees, so obviously they do fine.
My personal experience with draftees is that there is little difference from volunteers.
Teenagers and 20 year olds, are not exactly so fixed in their world view and philosophy and grown up determinations, that Army and Marine drill sergeants can't convert them into fighting men and make them grow up and unlock who they really are, nor can they keep some of their teen volunteers from finding out that they don't like the military after all, and that they joined without thinking it through.