2 - without prior config only a bunch can do it, like pixels 3 - there's a difference - you can configure wg/ts on a single device(router) and it's done, or you need to do it on 5X+ devices, phones and laptops and fix the configs on all if something changes
I've been able to do WiFi-WiFi connection sharing on my last four Samsung phones as well
I think every single pixel I've ever had could share wifi or 4g/5g.