The mentality to see out a match or to win a match comes down to talent, fitness and tactical awareness. If you lack any one of these you get found out when the pressure is on. We can all look at our own teams and see players who are extremely fit or talented or tactically aware but not many if any who combine all three. I think this a failing in coaching. Managers very rarely last more than a season so why should they worry about what's happening in the youth teams. Spend that budget on a couple of new players I'll look good and won't be here in 3 years anyway.
I don't see that as a problem. Players will find their level in football. It young footballers are ambitious and want to improve their standing they will work at what they need to get there benefitting their present club. The problem with a lot of players in Scottish football just now is they didn't make it at their OF club of choice, but have enough talent to earn a living bouncing down the leagues like the ball on The Wall without over stretching themselves. Usually accompanied by a manager who has liking for them.
Maybe the SFA and SPFL should insist a larger percentage of prize and TV money goes to youth coaching developmen.t I don't Know. I'll have another think next year.