The guest not being able to add attachment to comments is a huge deal breaker.

Also 80% of the sites I added keeps loading for ages. Support is asking to install an extension in case it happens.
Well... Sorry but I can't ask my clients to signup to yet another tool in order to comment and add an extension on their browser if the site does not load...

It really is a shame... I thought i found an alternative to markup.io pack in a LTD... I'll stick with markup.io