....Had I bought BTC instead, I would now have an extra 0.67 BTC = $65,800.
I lost $59,300.
No you didn't. You lost a potential gain of $59,300. That's not the same as actually losing $59,300.
I don't think this is news to any OG on this here famous thread. We've all been there.
It's what I call a "shoulda, woulda, coulda".
Thinking like that I could say I lost 95K because way back in the day, I sold a coin at $500. Because at the time profit.
Fair enough. Opportunity cost is not exactly the same as actual loss, even though,
with a little spin, it can be made to rhyme.

Is this not a good thing?
I thought every OG on this here famous thread hates Coinbase. Amirite?
(To be clear, I don't.)
Definitely not a good thing. Is a terribly risky attack surface.
I do openly dislike coinbase, and Brian A. But in a way similar to how I think the ETFs are a mixed blessing.
I dont know about OGs. I'm just a half baked poker player. Ok many of us want to be somewhat coy about our bitcoin stash, yet if many of us longer time bitcoiners might want to admit that over the years we have been mostly erroring on the side of accumulating and HODLing, then that does not seem like a poker player, even if some of us might have had been putting such value into bitcoin relatively whimpily and others relatively aggressively.
And sure, mistakes were made along the way, too.