I have a combination washer/dryer unit. It doesn't do a great job at drying, but it does remove enough of the moisture that it takes a couple days to get musty. It's nice that I can just stick a load in before bed, and besides wrinkles, there's no problem with me not getting to it for a day.
The combo units have tiny drums and take longer than separate units. They wouldn't be suitable for a family with kids, but for just two people It's been pretty convenient.
You can do a wash cycle, check it and then do a dry cycle if you're paranoid about it. Personally I just chuck stuff in mine on a combined wash and dry and it comes out clean and perfectly dry. The first unit I bought was shit and barely ever dried anything properly but I sent it back and got a Samsung instead and it's been flawless.
I always wondered if a 2 in 1 washer/dryer was a thing but never bothered to look it up I guess, so thanks for that fact. Now I am off to restart the washer because the load I ran 2 days ago and forgot to put in dryer is now smelling a bit off