Shares of BRK.B are available to anyone who wants to buy them. So they can participate in those gains as well.
What you're really getting at is tax incidence. Ultimately corporate taxes are still taxes on people. It's a complicated question to figure out which people. Sometimes it's shareholders like buffet, but it's also often employees or customers.
I do generally agree with you though that corporate taxes probably fall disproportionately on rich shareholders so to whatever degree there are shenanigans it's probably benefiting those rich shareholders.
Personally this makes me question the value of corporate taxes entirely. Just get rid of them and tax people directly. It would save a lot of paperwork and be easier for everyone to understand. Most people disagree with me on this point (though I would say that's because they don't think about tax incidence!).
What you're really getting at is tax incidence. Ultimately corporate taxes are still taxes on people. It's a complicated question to figure out which people. Sometimes it's shareholders like buffet, but it's also often employees or customers.
I do generally agree with you though that corporate taxes probably fall disproportionately on rich shareholders so to whatever degree there are shenanigans it's probably benefiting those rich shareholders.
Personally this makes me question the value of corporate taxes entirely. Just get rid of them and tax people directly. It would save a lot of paperwork and be easier for everyone to understand. Most people disagree with me on this point (though I would say that's because they don't think about tax incidence!).