What's your general view on what has happened?
For eg...
Better quality youngsters?
Necessity, as injuries etc have made us dig deep?
Deliberate policy to try youngsters rather than juggle square pegs & round holes?
Other?
Playing this with a straight bat, I think it's an element of all those things.
I'm not a regular watcher of the age group teams like yourself and others on here, but when I do see them we now seem to be producing different 'types' of youngsters. Some with pace, some with height, some with skill, some with power and some with a combination of these tools. When I watched a little more of the younger lads when I did still live in Sheffield we seemed to produce a lot of 'okay' players with rounded attributes but no stand out athletes (Seriki, Jebbison), and rarely (Diego aside of course) any players with the skill, craft and pace of players like N'Diaye and hopefully Osula. We had a lot of young players who were good at u21/23 level such as Jake Wright, Jordan Hallam and others, but looking at them objectively I always thought they were lacking that extra to make them a higher end football league player.
There's also a point in the past that we did sell some of our more promising youngsters to fund the first team such as Calvert-Lewin and Ramsdale however we've just done this again with Lankshear. It was fruitful for us with the former two as it funded our double promotion but time will tell on the latter, though I would assume without knowing he wanted to go as he seems an exceptional talent for his age.
I think as you say injuries are another huge part of the puzzle. Under Wilder we sent out 9/10 of the same starting 11 week after week with remarkable ability to keep them all fit. Since the last PL season and even more so after last year's pre-season under Slav we've struggled with injuries more than I can ever remember which is always likely to open doors for academy players.
The final point is of course in the mind of the manager. Wilder looked to the shorter term goal (quite rightly at the time) of getting us out of League One and then keep up that momentum to get us into the Premier League. Blooding younger players always carries a risk factor against results and I think CW didn't want to take that chance. The downside of course is that such a rapid rise is unsustainable without considering the future and people will now rightly question the choice to spend £23.5m on a largely unproven Liverpool striker over spending half of that on a proven Championship number 9 and rotating in Ili N'Diaye who CW seemed to largely ignore. As soon as a few injuries hit under Wilder our back up players simply weren't up to the task and having blooded no youngsters over a 3 year period Wilder didn't have any aces in the pack to turn to.
Hecky seems to have got the unreserved backing of the board to do it his way and is also doing a very good job of getting us more than competitive at the top end whilst bringing in the younger lads when he feels it is appropriate.
I think the chances of all or even some of these lads making it at this level and the one above is slim as always but SUFC is a good place to be at the moment with an ever broadening pathway to the first team. On the flip side I think CW chose a shorter term approach to try and bring that immediate success and without looking into his management history in depth I'd guess he's done that wherever he goes.
Reading all that back perhaps the question comes more down to 'What benefit is there to a manager trying to create a pathway when they are likely to be out of a job if the first team suffers a run of defeats as a result?'