Being hezemanim in the Yeshiva learning world is only 3 weeks Long from Tisha B’av until Rosh chodesh elul and not months long line you mentioned or as long as the children’s summer season months between school ending and the new school year starting again
I think you need to remind yourself that bein hazemanim is just a short time for them to refresh themselves for the entire new upcoming year ahead starting from elul already. learning yungeleit are humans too and need a break to refresh themselves for the new year of learning ahead.