Since all everyone else is doing is laughing, i'll try and help:
1: No. There is no compatibility with the Watch outside of an iPhone. you would have to move to either android wear or a Samsung galaxy watch
2: No, The homepod only works for Airplay based devices or Apple Music. You will still require an iPhone to configure it.
3: Yes, Google Home app is Google's variation on the homekit app and will be compatible with most homekit devices. But you will likely need to reconfigure everything
5: Yes, AirPods will work but only as standard bluetooth headphones. No W chip compatilibity, so you do lose the easy device switching and SIRI shortcut.
I've not done full ecosystem changes, but have bounced between iPhones and Androids a few times. But I tend to use only services that are platform agnostic so that it's easy to change without having to rebuild/redo all m data.
for basic data on the phone, Samsung does hav a migration assistant program that will seamless move contacts, photos and other data from your iPhone to a samsung device.
is it more work than worth? that depends how vested you are in one ecosystem or the other and how portable things are. Moving to android might pose some headaches for some of the iOS or MacOS specific functionality (Like AirDrop if it's in your workflow). But then somethings like Apple music will work fine on Android.
There will also be some learning curve as Android and iOS just behave in slightly different ways for some things. For example, the way notifications are handled are different. Whether or not you find it better / worse, will be more just a comfort thing.