Wouldn't it be?
Seriously, I agree with you. In the strictest sense, PT requires an integral heat shield. But PT is really a marketing phrase, and it's been used plenty of times before when small attachments were still needed to complete transformation. Like, weren't the 1/55's always considered PT?
That's actually pretty comforting. I never knew it was just sliding in grooves, and now that I know, it does seem too simple to leave out. (I saw a more complex integral heat shield design in some hobby mag once, so I always thought it was complicated. )
I wonder what's so different about the new 1/60 that will make two-seaters possible.