saving Bitcoin doesn't stimulate its economy, which hinders adoption 

 You sound like a Keynesian. People will naturally use Bitcoin however it benefits them most. Right now, for most people in the West that means saving it for the future. It is irrational to use a rapidly appreciating asset for purchases unless you have no other option. And yes, you can spend and replace, but there is friction to some degree there. I do spend Bitcoin on occasion, but my point still stands. Saving Bitcoin is using it. 

 a Keynesian? what is that?

agreed that not everyone has the "luxury" to spend their sats. I say that in quotes because 1BTC = 1BTC at any time, most holders don't want to spend it because they're always comparing it to an inflationary currency (USD, EUR, ...)

but holders of Bitcoin who can spend it, should do it as much as possible, otherwise Bitcoin is just a gimmick, instead of an actual currency 

 If you leave 100usd on a table and not do  anything with it and return in...say 5 years what would you find? The same 100usd, with today economy, probably even less stronger than they were 5years ago.

You might want to say the same about other classic assets but is not the same.

Probably more than 50-60% percent of the globe not even heard of btc, 15% heard of but don't know what is it. Who has it stack it... what is the point of having it?

I swear to god I don't understand the value.
While a piece of art, or a house or gold and cash for that mather (safe heaven assets), have a teoretical value, but that value can become tangible when you sell that thing. Same goes with btc. You look at your wallet, probably dispay is showing usd 😉 because 3.543375btc means nothing but 80000usd do and you are proud. Guess what  that is a theoretical owned value. Unlike your bank account these money are not actually in your posession.

To lift btc of the ground we need to start moving them around, gain some network effect, it been 16 damn years. C'mon.