It is very hard, time consuming and boring to iron out those finishing issues in any software product. You need team of people being paid for that.
When doing it for fun, I just go until it works and until it is fun. As soon as I come to those last 20% I never touch it anymore.
So ai doubt it will happen until more companies start paying decelopera to do it. But I don’t see the business model in that, so I doubt it will get better fast.
Problem is so many websites are slow for no good reason.
And JS is being used to steal our info and push aggressive advertisment.
Which part is unknown to you?