I don't like the size of RIGHT-SHIFT on the mini model. When using Vim keys, I always find it more convenient to have a full-size SHIFT on both sides of the keyboard.
This is not specific to Logitech, however. Many mechs do that for whatever reason.
It's about space savings. 1.75u width shift is considered a 'standard nonstandard' size for a compact keyboard, and it's generally worth the squeeze for the extra full-size 1u key.
This is not specific to Logitech, however. Many mechs do that for whatever reason.