The issue is not only ekagatta. It is the whole re-interpretation of Anapanasati with body-of-breath instead of simply the body then body-formations, etc. This corruption of Anapanasati makes you believe that you have to let go of the body including breathing, heart beat, etc. The Buddha made fun of such approach. Unfortunately that’s the one that is now mainstream.
Wishing you all to experience the true Buddha Jhānas.
SuttaCentral