This would be a fantastic feature - my clients are always on the go and typically do not have a computer with them.

Also email. https://ideas.gohighlevel.com/email/p/bulk-email-from-mobile-app

But of course any solution should de facto solve the other since the critical missing piece is select multiple/select SmartList.

Definitely needed, a client just asked for this as they don't always have their computer with them and need to send bulk messages to entire smart lists.

This is needed, need to send bulk stuff On the go

This is highly needed. It should work the same as if you were bulk messaging on desktop. Select all contacts in a certain list, add a template/snippet if needed and send/schedule accordingly!

Bulk SMS by (multiple)tag(s) would be extremely useful here so as not to have to send to every single (and possibly a non applicable) contact. As an agency we have hundreds of sub accounts and sending each a unique message based on tags would deliver target specific messages, save costs, keep relevance high, and DND low.

My primary use case is for nonprofits to coordinate their volunteers. The volunteers aren't in a shared group text. They are getting individual reminders of show-up time for the next event. They are confirming (or declining) availability individually. Their responses shouldn't be seen by other volunteers.

This sounds dangerously powerful don't you think Dalton? Maybe a couple of safety steps in-between?

Just had a client ask for this. Was very pleased to see it is on the roadmap! Thank you HighLevel dev team!