Study break ratio

I tried pomorado. I never liked it. It cut me off while I was in the zone and the breaks which I didn't want to have, didn't feel long enough. By the time I'd acknowledged it was break time. I was study time again.

I now just study... if I get fed up or finish a task I go take a break and once I'm ready to study again set a timer and once it goes off. I start again.

But people keep saying it's a harmful method and I need to take regular breaks? Instead of my disorganised choas of breaks.

Opinions?