Footballers (male) coming to the National Team have now been in Academy systems since the age of 8. Along with the football side, they do have mental strength conditioning.
Also their education is supervised.
Outside of that bubble you have specialist private schools like Millfield who produce swimmers & rugby players at international level from the age of 11 upwards.
Cricket is also now ALMOST exclusively taught in “elite” schools- ie mental as well as basic games.
For other sports and the masses, it is pot luck. You have a good school or a good coach then you will develop- look at our Gold medal tally at recent Olympics.
But compared to for example the US System, the UK education system is geared to create teachers (#sweepinggeneralisation) whereas US create NFL Stars.
UK is improving Football is improving, cricket is. Equally eg Womens Basketball could qualify for their 1st Olympics next year.
Lottery funding and elite programmes are making a difference.
English Women’s WC team did not have the physical parameters- pace, stamina. Did not have technique - passing ability. Simply because the domestic game is not yet at a true full time elite sport level.
Last season the WPL or whatever started. Give them time.
Anyone outside the bandwagon bubble of the Lionesses could see those failings in previous games BUT the girls showed how they have improved.
In 4 years the development could make the next generation better actual footballers