I can't imagine there is any benefit for him playing at that level now.
There are several young but established Prem players playing - also this is the actual Euro U21 Championship finals, not qualifiers or anything. I hadn't realised this until now. Group stages are played in this international break, QFs onwards are played after the domestic season ends. Surely it's good to give the current crop of young players, who may only be squad players (or not picked at all) for the senior Euros, a taste of proper knockout international competition. Bit difficult to complain if our senior players fluff their lines in subsequent Euros/WCs if we miss the chance to actually test them in that format beforehand.
That said I think he'd be a decent shout as a back-up forward for England this summer, he's definitely got something special about him. Kane, Rashford, Sterling, Sancho, Calvert Lewin, plus Greenwood perhaps. Although I'm sure I'm missing someone obvious!