It happened last summer, and it'll happen next summer.
At every major international tournament a breakdown will be done explaining the critical role the EFL has played in the England squad's development.
Whether it's Jordan Pickford, Jude Bellingham or even Harry Kane, pretty much every member of the current Three Lions side spent time in the Championship or below at some point in their careers.
How much loans or time further down the pyramid helps players is up for debate. It doesn't always work - I saw Premier League 2 top scorer Tom Dickson-Peters join Gillingham on loan from Norwich in 2022 and fail to score.