It seems that the devs beg to differ, hence the whole reason for EIP-1559 and "fee burning".
No they don't.
Ethereum is a global supercomputer. The EF makes up its own mind about how many ETH to keep in circulation based on keeping the blockchain sufficiently "liquid" so that people can still pay fees. Now that PoS is coming, they also need to make sure that everyone who wants to stake, has a chance to stake. The validators then ratify (or don't) the plans of the EF as always.
How or why they're targeting a specific number of ETH in circulation is unknown to me, but it's intended to make the blockchain function and to keep PoS sufficiently liquid to avoid 51% attacks and other problems.
Etheruem has been reducing mining rewards for awhile. The EF's decision to start reducing the total number of tokens in circulation is consistent with that trend. It's likely they circulation number is higher than what they consider to be healthy for the blockchain's function, so they're dialing it back a bit. I can't tell you if they're right or if Ethereum would be better off with twice the number of tokens in circulation.
Regardless, ETH in and of itself need not be worth $3200 or $4000 or higher for the blockchain to be functional. High ETH prices make it easier for the EF to incentivize developers, but at the same time, Ethereum development has slowed to a crawl, so I can't really argue that the high value of ETH is healthy for the blockchain.
When I go to
ethereum.org/en/eth it says "WHAT IS ETHER (ETH)? Currency for our digital future. ETH is digital, global money. It's the currency of Ethereum apps."
You said it right there. "It's the currency of Ethereum apps". You need it to run a dApp on the blockchain, period. It's not there to be a method of resolving debts, which is the role of traditional currency. They used to say it was "fuel" but I guess they're using slightly different language now.
If someone will accept it as payment or in exchange for some good or service it's a currency.
Not necessarily. That's like saying Chuck E. Cheese tickets are currency when I can turn them in for a cheap piece of junk at the prize counter or trade them to my friend for $5 because he really wants that cheap piece of junk for himself. ETH specifically is used to "pay" for time on the Ethereum blockchain. If anyone else decides to barter for it, they can, but ETH in-and-of-itself was never meant to be tender.