I really like your mindset. For me 1 BTC is just 1 BTC. No need to consider its $ price.
But keep in mind many people are here just for speculative purposes and don't care about blockchain technology, Bitcoin and so on. They think to cryptocoins just as a good way to make some dollars buying it and then sell it at a higher price. That's why people look so concerned about USD price.
Talking back if bitcoin would tend to have 1 btc=1btc value then where does its value came from?
If we ignore the conversion rates of fiat it'll depends on the demand what people want to trade bitcoin with and the limited supply we have for bitcoin. Halving event helps a lot because it reduces the amount of bitcoins being produced every 4 years making bitcoin more valuable.
Donations here in the forum is still the same 10btc and 50 btc no one wants to spend that kind of amount now. The same thing would also happen for services that ignores fiat prices.
That will never be possible. USD and other currencies are required for proper calculation and other reasons. Despite I dont know much of the reasons, one thing Im very sure of is that USD is very, very important. And by the way, Bitcoin is not a real currency, it is just meant for investment purposes only and nothing else.