This was also about confiscation. Obviously it's more difficult to tax/confiscate something you don't know someone still owns or is harder to surveil. Even when buying Monero from one of the few centralized exchanges left that offer it - as soon as it leaves the exchange the trail is lost by default.

Bitcoin:
You say you lost your keys? "We see it clearly moved after you told us that"
Someone hacked your keys? You sent to the wrong address? "We see you later consolidated Bitcoin from your 'hacked' keys/burnt coins with your current Bitcoin"
Coinjoined to throw them off the trail? "You mixed your funds with these criminal proceeds, so now you're a suspect (even if you're truly not)" i.e. Roman Sterlingov

There are still ways to mess up on Monero too, and you can do things on Bitcoin to avoid the things above (requires relatively large time commitment to learn and constant maintenance going into the future, which you or your heirs can still accidentally mess up later) but there are far more ways to screw up on Bitcoin. All things equal, Bitcoin is much worse for plausible deniability.