We must separate the issue of „how much does the government steal from us, using taxation as a lever“ from „what specific taxation mean does the government apply“.
Under this premise, the idea of taxing unrealized capital gains is not a bad idea. It becomes bad when the government uses it as an excuse to collect more tax revenue; but this is not a mtger of capital gains taxation as such.
Wealth tax is even better, as it incentivizes people to invest their money, which is crucial for the economy. It just doesnt truly work that well right now in Switzerland, as we currently face nearly zero inflation.