The one I know who actually want to use Bitcoin et al and/or work in the space (not outside "investors" who just want to earn as much money as soon as possible), don't consider the exchange rate important at all and couldn't care less about it, as Bitcoin is not for exchanging it to USD/EUR/whatever.
But presumably they care if bitcoin is still exchangeable to something (maybe goods and services?). The exchange rate to currencies determines the exchange rate to everything else. If they don’t care about exchanging bitcoin for currencies or goods or services then what is the purpose of BTC? Both currency and store of value use cases depend on exchangability.
There is a concept called Bitcoin maximalism that means, in my understanding, that the whole world would switch to BTC so that the exchange rates to other currencies wouldn’t matter anymore.
It’s easy to get paid in BTC if you land a crypto job, but it’s the groceries part that I can’t really imagine yet.
That's not an accurate description of BTC maximalism.
Usually a BTC maximalist means that within the context of crypto, they are BTC only and aggressively and passionately reject every other crypto token. This is what you call call a common maximalist stance.
Out of that group, a small minority is a believer in "hyperbitcoinization". This is an event where BTC becomes the dominant asset class, at the expense of gold, bonds, etc, with a market cap prediction for BTC ranging from 10-100T.
Even people with that (unlikely) hope, do not claim any currency replacement, only an asset shift.
So given the trilemma then, it sounds like Bitcoin maximalism means fixed exchange rates (since all countries use BTC), and free flow of capital (since that's the BTC ideal), which means no country can set independent monetary policy.
So you essentially have the Eurozone problems but across the entire world. Seems like many countries would try to avoid picking that side of the trilemma.
But even maximalists care to be able to use bitcoin to buy goods and services (eg be able to spend it). Since other currencies are also capable of being exchanged for good and services then the exchange rate to other currencies determines how much goods btc can buy (or there will be an arbitrage opportunity).
But even in a purely BTC universe, wouldn’t the relative value of goods/services stay the same? You’d still need more BTC, the same way you need more fiat today.
One of the few avenues for entertainment remaining on social media are watching BTC maxis and ETH bagholders argue that the other is completely useless.