Game designer question

My apologies if this is completely uninteresting to you folks, but this has haunting me for a while.

As far as I know, you can use HP potions nonstop in RO, which is a common problem in classic RPGs. This likely causes problems like PvE being too easy, or 1v1 PvP battles being quite boring at times.

How is this solved in this game? Is it just patience or are spells/something to cut healing regularly used? If my description of the game is correct, do you have any opinions on the subject?

If you have video reference, that would be great. Thank you all!