That is another issue altogether. The reason it takes so long to sign up is that there is a cost associated with signing up to provide the bandwidth needed for a new account. There is no cost to the new person signing up but there needs to be some Steem Power assigned to new accounts so that you can upvote, comment, and post. That has to come from somewhere so new accounts get some Steem Power delegated to their account until they earn enough on their own to not need that anymore.
It is an issue that will need to be addressed before it would be ready for mass adoption. There is a way around it if someone wants to fund their own account.
There is a cost to sign up here but you don't have to wait for someone to delegate Steem to your account because you can fund it yourself. So, it is instant but you bare the cost.This website does just that. https://anon.steem.network/