The current way to detect an upgrade and actually do it is very much out of step with how I work on any other project: it involves clicking around an admin to see if an update has been published, duplicating code, and either copy/pasting manually or doing some kind of download and copy/paste job.
This could be improved in a few ways:

Hey there!
The theme update system is Shopify’s domain, and not something that we can change as theme developers. You can keep an eye independently for theme updates via each theme’s changelog. The rest here isn’t actionable as a theme feature, so this request will be closed.
Thank you!

