As someone who owns both and a PC as well, yes. Playing my steam library in bed is incredible. Also, if you have a larger library, it can be cheaper to just buy a Deck than re-buying everything on a different platform.
Maybe. I have those two and a PC and I think the Deck is essential. But I do really like being able to seamlessly pick up my games on my main machine sometimes too. If I didn’t own a PC or a PC game library it might be less enticing but even then I still think it’s worth it. You may struggle deciding where to buy games though and you will probably end up building a gaming pc if you enjoy the Deck.
This is fantastic, I missed out on buying one during the summer sale. I've had great luck with refurbished devices in the past hoping the same since they claim to have high testing standards.