66% is insane, like if I saved up $500k to retire, I’d like to be selling some every year, like 5% (actually a little more but this is for easy numbers). That would get me $25,000 per year, then I’d pay capital gains tax on that and have about $20k left over. A modest retirement, could move to somewhere inexpensive and retire on that.
A 60% capital gains tax means I would have to save 1.5 million dollars to achieve that same retirement.