I started my seeds way, way too early. I did have them under lights but yes, didn't seem to help much and they ended up looking like trees what with the long stem ad then the growing leaves way on top. So I planted those stems in ground.
I think that it is okay to do that because sometimes people say for Squash Vine Borer to cut out the larvae and then pile soil over the damaged section so that it will root. If that works then it should be okay just to bury the stem in leggy seedlings.