I think for a cryptocoin to be useful in the real world, scaling and quick transaction times has to be a priority from the start of the design. Its not something you can fix, as an afterthought.

That's why I like xrp. Low transaction times, and it scales well. It is permissioned in the sense that every validator-node needs to keep a list of all the other validator nodes it trusts. Which means validators without a reputatable company behind them, might find it hard to become trusted by anyone else. Thats a price worth paying for scalability, in my opinion.