This is exactly what happened to me when I tried using this technique in the past. I love using my calendar, so I had the bright idea to merge my to-do list into my calendar so I could get more things done.

That was a terrible mistake lol. My calendar became cluttered and stressful/distracting to look at. I ended up ignoring my tasks and then almost missing actual deadline/events. After a couple weeks of this, I deleted all tasks except for repeating tasks and then using Microsoft To-Do.