That's true, although I don't think it'll completely close the gap.
The Men have mostly been able to keep up in new fields that Quendi haven't dominated by virtue of centuries of experience. And even then they're inhibited by lack of prerequisite background - electrical engineering took a lot of math they're just too young to have absorbed as well as their counterparts, although some of them managed it anyway. That part should sort itself out a little with time alone, though. The only unambiguous advantage of Men is that they have kids around - Quendi rent them - and that discrepancy will disappear postwar.
Well, I could teach them to teleport. I'm planning to share that around a lot more after the war.
The problem is I can't transmit the spells bare, they'd all come with the ability to reverse-engineer them.
But once I can do the part where I can get back to my own galaxy it's much less of a problem, my galaxy can roll with that kind of capability readily.
"Water." Slightly iced water. Yum. "Anything in particular besides the air filtration song you wanted to bring up?"
"Well, you also didn't get the one I play Governor with. But I can come by more if you like."
"Well, commenting strictly on Governor, I don't think he lets me win."