What's not normal is trying to use tarrifs the way the US is, and the frequency of their adjustment, as well as stated motivation (punitive rather then achieving any sort of strategic goal).
Can't really comment on "more expensive = higher quality" since I'm biased towards France where I believe they're better at cultivating tomatoes than the Swiss.
If you do internal subsidies (the EU/US approach) instead of tariffs on imports, then a fraction of your taxes gets diverted to farmers instead.
Sadly this whole issue is difficult to side-step completely because if you do neither subsidies nor tariffs, your local food industry just dies and that is a really undesirable outcome if you want to avoid famines.
If Switzerland opened to EU competition then they would’ve seen multi store farming like in Netherlands. Subsidies would fare better.
https://www.thetimes.com/travel/inspiration/ski-holiday/endl...