If you could figure out some way to get a clear collection bowl on that fermenter, you might not mind not being able to see through the FV body.
I have the 3 gallon FastFerment and it uses a attachment that lets you put any size small mouth mason jar you wish to on it. Then with the valve left open, you can see what is going on in the beer and what it looks like after you have dumped the trub from it.
With any other type fermenter you use, at random times you'll get spewing events where foam and other crap comes out of the airlocks or blow off tubes. And your plugged valve I'd still put down to inexperience with the FV and not dumping all your trub at the appropriate time. I dump almost all the trub a day or so after the krausen.