I don’t see the problem with sending youngsters abroad. Until Covid struck thousands of youngsters took a gap year often working in remote areas without the protection of a football club or indeed anyone.Agreed, we shouldn't really be sending kids abroad. But, when players reach 20-22 they are at a point where they've probably already been on a loan to a lower league club and probably not been wholly successful. We tend to send players out (Smith, Slater) to clubs but then just send them to a similar club the next season. If they're not developing but you're hoping for a breakthrough I think abroad is a good option. Belgium/Dutch leagues, for example have some really good clubs but also some distinctly average ones. As long as they're good enough to start for said team, then they're going to get match time and also play against some top players. You could probably chuck Scotland in there as well.
The U-23 and U-18 levels we play at are so poor. We really need to focus on improving this. I assume one of the reasons we field younger teams is the strength of the opposition. It has clearly not worked so far. The U-23 need a much bigger challenge than they're getting. How we do this quickly, I don't know. We could farm players out but they'll be going to non-league or maybe a few in League 2 but not starting.
Clearly you have to know the individual but working abroad should benefit most who are capable of making a living in professional football.