No worries
That makes sense, I've only flown the 332 once when it was subbed on LHR, and I had 10L (so 25L?) and I quite enjoyed it. That said, I don't think it will be half as enjoyable on a PVG!
I am firmly a window person - which is why it was quite hard to turn down row 33 on the 346 when I was off to SCL earlier in the year due to the missing window there... Row 21 seems like a no-go on the 332, especially if it's anything like row 21 on the 346. I'm thinking of choosing a normal window and hoping for the best on the day... The possibility of having the pair to myself and raising the middle armrest seems like quite an advantage, too.
Perhaps as the flight approaches I'll reevaluate the loads and see what makes sense - I've looked at the seatmaps for two flights this week and the flights were showing 9 throughout except A, I believe, with some quite empty seatmaps just before departure!