Without gutters water will get into places that are not meant to be wet, and that’s when you start having serious problems.
When you have water that seeps into parts of your home that aren’t meant to get wet you will end up with both structural damage along with toxic black mold.
The additional weight added to your gutters from the debris lodged in them can also contribute to your gutters leveling out, your gutters deforming, and your gutter hangers becoming damaged as well. Clogged gutters are a common problem, and they are a problem you can’t afford to ignore.
This is not something you want to have to deal with, so paying attention and avoiding problems is your best option here.