How can you say BTC has no good function? What are you basing your statements on? It's not my favorite crypto by far but it is the original, and right now it is about the only way for anyone to get into the crypto market from fiat.
Is it the fastest crypto? No.
Is it faster than a wire transfer? Yes.
Is it faster than mailing a check? Yes.

Are the fees the least expensive of any crypto? No.
Are the fees lower than a wire transfer? Yes.
Also the fee for sending bitcoin is THE SAME weather I send .001 BTC or 100 BTC
Is this true for wire transfer? No, for that it is a percentage so to transfer a large amount of $$ you will pay a large fee.

Like it or not Bitcoin is the originator and, currently, the most widely accepted in terms of real-world purchasing, so why all the hate?
It seems to me that BTC can only be a good thing for ALL crypto, sort of an ambassador of crypto to the noobs.

1. BTC price goes up,
2. people talk, positive news reports are filed,
3. noobs get interested, noobs invest,
4. invested noobs now learn of other (kick-ass) cryptos and move from BTC to their new fave
5. Noobs no longer noobs,
6. We all win
   :)