IEEE MACsec

I know this is a NANOG forum but curious how widespread usage of MACsec might be. (https://1.ieee802.org/security/802-1ae/).Currently reading the spec but wanted to pose some questions. I'm seeing some pitfalls:     1) May not work over wireless LAN devices?     2) Needs a centralized key server.     3) May not be supportable on all devices? Purported to be faster on the LAN than IPsec because MACsec is on layer 2. Thoughts?