Nice review for both comparisons on the 1/60 and 1/48 scales. I have the same thing about those vertical pegs for the arms under the fighter mode. They should have had some side pegs to connect to the legs. Seeing your side by side of the 1S with so much tampo, makes me think of my Takara seekers. IIRC, I think Shoji also designed these, and the "no step" markings are everywhere but they're less obnoxious because the markings are smaller and seem more realistic. I do like the tampos but for future releases Bandai should take a page from Takara. Sometime I'll dig it out of storage and compare them.
@jenius on a related point, the bandai stand is so boring, you have to take it apart for each mode, and it needs some force. Also the 1j stand is boring it only does one mode. for the yammie arcadias, I don't recall which it came with but I got a clear big stand that I prefer over the launch arm (the launch arm looks nice cuz it's like the movie, but it's not that balanced). The clear big stand might have come with GBP (?) and I like that it's sturdy and easily adjustable and has storage options. I got it a while back. I'd expect Bandai to come up with better designs since there are so many better stands out there now I've seen come with similarly priced collectables. That Bandai stand that comes with the $1000 Nu Gundam is a display that might work with the DX. Or some stands for heavier toys have ratchets and locks for flying poses. I don't mind buying a separate stand if it's nice but the stock stand isn't very good.