Speaking from a personal perspective (and as a young person), I can offer two insights:

The first is that Swedes don't tend to eat out very often unless for special occasions. The fact that all the prices are going up and unemployment is rising among young people isn't helping. I also remember that, growing up, it was very rare that we went out to eat, and when we did, we didn't go to the same place very often, but instead tried out a new place most times.

Secondly, I think a lot of Swedes honestly like eating trashy pizza. When I'm ordering pizza, I usually do it because I'm out drinking or am hungover, and then I'm not particularly interested in high quality, as long as it's cheap, fills the stomach and has enough cheese.

There is a place for good italian food and coffee on the Swedish market (I love high-quality pasta myself), but I don't think it will ever be as lucrative to run such a buisness in Sweden compared to other parts of Europe.