You clearly don't know how long running serialization works.
The purpose of those manga is to prolong the story as long as possible, as it maximize the profit.
They only wrap it up when there is nothing more to squeeze.
It's not like they are that bothered by the kisses either. They have their own reasons for acting this way which will be revealed in the next dozen chapters.
Minor spoiler: the country of MC was the cause of the curse.
It is not really wish fulfillment. Later in story he encounters a girl that can negate both physical and magical attacks.
Meaning that there are a lot of characters in the story have cheat skills.
Levels are meaningless if the opponent has instant death skill.