This question has got me thinking of the possibility we could have been enjoying if there is nothing like the Ethereum blockchain that gave possibilities to the development of all the other chains in the crypto space today, I know one of the advantages of the ethereum blockchain is the fact that it gives room for scalability and possibilities of getting services that the Bitcoin blockchain may lack. But another setback is the adoption level since the ethereum blockchain gave birth to several cryptocurrencies it makes it hard for mainstream recognition of a single crypto coin which was the original intention of bitcoin.
And that's what crypto is all about though, I mean Ethereum gave birth to different blockchain to compete against them. So nothing is wrong with that and on the contrary, it gives developer options at which their project will run, maybe it was it Ethereum or BNB or any other mainnet.
I don't think that it was the original intention of bitcoin to have a single crypto currency. It's main purposed is to be another for micro payment scheme but since then crypto has evolved so much already.