thank you for your extensive answer. as I can decrypt from @gandalf's answer it seems there is easier onboarding on the roadmap / in the works. you are very right that those whomever already working with metamask or phantom should easily be able to be onboarded :)
I saw from @howo's meeting summary that MetaMask support is in progress. Since INLEO is working on few more wallets with a FOSS release on the way, it would be definitely possible to see some collaboration and rapid development. For the time being, it would be great to have Keystore support for more DAPPs. There should be at least a million people who already have a Keystore.