I am looking at the Bitcoin space and I see great things happening in progressive steps:

• Looking at the commits to the Bitcoin Core is one indicator
• The Lightning Node Network is another great development providing a possible future for feasible use of POW based cryptocurrencies in micro and everyday transactions
• Wallets have come so far from the days that I started using Bitcoin (UI's, )
• Exchanges have also made leaps and bounds (However, given the role they play, I feel they have a lot to improve on to be up to spec.)

My question is, what do you think are the current critical frontiers in infrastructure development in Bitcoin? Not just the Protocol itself, but the entire first and base application (currency). I guess we could categorize it thematically:

• 1st and 2nd layer Protocols
• Ease of Use
• Exchanges and third party infrastructure

if you can think of other development themes, please let me to know to add it to this list.

But it would be great to have a thread where we discuss the developments, why they are critical and what efforts are being made towards them.