The Flow mobile app (iOS/Android) buttons are fantastic! I'd love to have the ability to embed a mobile-style Flow button in a SharePoint page as a webpart or even using embed code.
Updating the status per the below comments - this is about web pages not lists.
Something like this (though more size/shape options would be welcome)...
I second this!
Context! Whatever approach is taken, there needs to be a way of injecting data into the flow trigger based on the screen context - whether that is the page itself, or something from another webpart - selected item in a list or gallery, etc.
I wrote a blog post on how to do this:
BUTTON IN SHAREPOINT LIST TO TRIGGER MICROSOFT FLOW
IW Mentor - SharePoint & PowerApps Training
This is enabled today - check out @WonderLaura's great blog post to see how: https://wonderlaura.com/2018/07/18/button-in-sharepoint-list-to-trigger-microsoft-flow/