People must realize the importance of bekiyus!
As the gaon said ” im ein kemach ein torah” if there is no bekiyus there can be no iyun. However it works both ways. But if your way of iyun, is one that in 5 years you will finish a single mesechta with hundreds of rishonim, acharonim, chakiras and diyukim, look at the biyur halocha quoted above, and think of the day of death.