Option for 1 click updates for all WordPress Websites, Plugins and Themes

Honestly, I'm not convinced that's a good idea. I host a lot of WP sites, and I'm brutal strict about them staying up-to-date, but due diligence needs to be done. It is also a daily task and not a monthly task. I use Infinite Wordpress myself as a tool for managing this properly in a single dashboard. It is not a 1-click magic button, but it dramatically reduces the work in doing this. There are other apps of this sort out there, but it has worked for me, with a reasonable workflow. infinitewp.com

 

Generally yes, and that's the point of auto-updates for minor core release points, usually security related. Major version releases have great potential to break plugins that a site might be dependant on. They should still be done of course, but there's no harm in waiting a couple days to go from 4.x to 5.0, so plugin authors can be more sure to be caught up. Backups (files and db) are also important before updating, though I suppose what level of service you are selling your clients. I'm pretty ruthless with my clients, but they know that before signing on. They like being on a secure and robust server. For my approach, Infinite WP or something of it's like, serves well.