Ames, for soda bottles, there are already do differnt “keilim” – as long as you don’t tear the cap along the perforation, its fine. At least, that is what I was told. I can open the bottle without doing that just fine. Its not hard in the slightest.
I open cans on Shabbos, I just don’t use it as a storage container (so I can drink from it, but don’t put it in the fridge or something). When I got married, my husband doesn’t open cans, but we asked and I was allowed to continue opening them. I forgot the Rabbi’s reasoning, so I can’t really comment on it. But, it is convenient…