Yes, I have shopped for smaller cups, & changed water bottle brands to accommodate holders. You are right, it's not a big deal but losing the door panel storage means not being able to easily change temp controls because cup holders are snugged up to the control slider and buttons [defrost on the fly] is "eyes off the road, drink moved to between legs" & is hard to adjust to.
The phone holder has already been enlarged by notching out one side holder to accommodate a my Samsung phone.
That was no big deal either, except that with phone mounted in the middle of the electronics panel, I cannot easily push buttons behind it to use phone connection, the "-->" to get to music on USB's. I did learn recently that I can retro back to using my phone for nav, phone calls and music WITHOUT the CROSS CONNECT app and that is much better, and is off my "big deal" list.
Please understand, other than the interior redesign, I LOVE MY SMART & will no longer be swayed by the concern my friends and family have for the "toy" I loved & gave up to please them... and have now replaced. Just tweeking the interior for accessibility. Any modification ideas would be appreciated.
One more thing... on the steering wheel there is an image of mouth speaking [right side, 3pm position] mine does nothing. What is that for and am I doing/not doing something to make that function ... for voice activation? Is that a phone setting or a car option that was not installed in my SMART? The dealer/customer connection could not address any questions without prefacing every comment with "in the Mercedes this does ___ but not sure in this car."
