I was in pretty much the same position. 2017 gaming laptop but it was having hinge issues so I finally upgraded to the Steam Deck. I have dual boot into Windows, a dock and USB hub, a keyboard, mouse, external hard drive, and monitor and even a tiny desk fan for good measure on cooling and I just primarily use Windows and then will go to SteamOS for portable gaming time to time. It has replaced the laptop well and fits a (larger sized) purse, and I have nothing else to say besides that it works pretty well for me.
Of course, it looks weird using it, but I can still be productive on the tiny screen outside using a giant monitor. It is very doable, it’s just going to take accessories and be kind of weird in general. But I’ve been at it for a year, so… it’s possible if you’re willing to set it up and find a way you want to do this!