Bitcoin enthousiast with some questions and concerns

Hey guys, been lurking around this subreddit for a while and I recently started really getting into btc instead of other cryptocurrencies. But I have some concerns regarding btc and its implementation into our economy. Here it goes:

BTC gives the consumer substantially more power, like the transition from autocracy to democracy. There are a lot of us, but we hardly dictate what the world reserve currency is. BTC doesn't give institutions, conglomerates and governments power. Actually it would take a lot of power away from these fiat giants, and give it back to us, the people... (insert bane voice) These giants pay our salaries and we spend our fiat at their establishments, and no functioning country would allow salary payment in BTC without a central banking watchdog and taxes being paid. The only thing BTC would give them is a way of bypassing governments (which they already can with enough money), and bypassing banking fees (to be replaced with transaction fees(if they don't use lightning)).

And the bigger elephant in the room is deflation. We are observing it already, fiat is currently failing and institutions are hoarding BTC to put it in cold storage, because it is so scarce. If fiat loses most of its footing, this issue will only get worse. If this gets worse, no one in their right mind will spend a penny(=SAT) more than they absolutely have to because their BTC will be ever skyrocketing. A long deflation period will start with people scared to spend their BTC. So the entire economy, currently being propped up by printed fiat, will crumble. I think deflation is scarier than inflation because of this. During high deflation periods people will hoard money and during inflation people will hoard assets. Imagine you have 100 bucks and you buy a car, but the next day the car is 90 bucks because the money is worth more. You will have everyone sitting on their money waiting for the lowest of the low or an indefinite stagnation period. During inflation people are inclined to spend their money because today that car is 100 bucks but tomorrow 110.
You already see it in this subreddit, people think others are stupid for using their BTC as a currency because it will be worth more. No economy will be able to run this way, so how can BTC ever become a replacement for fiat (or any currency)? Sidenote, how is BTC really decentralized? A friend of mine pointed out that 0.5% of BTC wallets contain more than 2/3rds of all BTC. 4 of the biggest mining pools contain 58% of all available mining power. The only thing that makes it really decentralised is validator nodes (of which we have subjectively too few).

Now that I have made a few people very angry, I love BTC. I love the power it gives back to the consumer. I love that I can truly own something that can't be taken away (if stored and secured properly of course). I own BTC and am in the process of stacking SATS. I run a BTC node with 5 outbound and 3 inbound channels to do my part. I even made my own steel seed phrase plates. But still, I have some serious doubts about a few things. And I really hope you guys can clear some things up for me, because I am a diagnosed smoothbrained individual. If you do so I will start allocating more of my savings budget to stacking SATS and open a few more channels on my node so win-win! -Thanks in advance :)! * English isn't my first language so spelling/grammar.