Our subs bench for the Crystal Palace game last season was
Begovic, Kenny, Godfrey, Welch, Allan, Davies, Van Der Beek, Alli & Gray
So that was one 'young prospect' out of 9 subs in a game we already had Mina, Townsend, Rondon, Branthwaite, Gbamin, Nkounkou & Patterson all unavailable!
It doesn't matter if Rondon isn't very good or not! He was picked regularly last term ahead of players such as Dobbin or Simms! Just because we can bring an extra 2 from our 9 subs off the bench next season doesn't mean clubs are going to use those 2 lads as youth prospects!
Lampard is more likely to do this than other managers in the league, but you saw against Boreham Wood he wasn't going to bring Welch & co on, until we got another goal, as he didn't want to risk it! How often next season do you think we are going to be in enough of a lead to give an 18/19 year old minutes ahead of an established (rubbish or not) 1st team player