My kids have a simple drawing package on the computer which does much the same. Having childish icon buttons images to suggest what the command does is not at the top of my required list. Most (all) of the people I know who use SketchUp are grown ups (they shave, drive cars, wear make-up, can dress themselves without their Mum’s help, most of them at least) so they don’t need to be spoon-fed what’s contained within the command by the button image.
Again, maybe when you’re very first using the software but after 15 mins of use most of us can remember where most of the commands are, again without the need to be spoon-fed.
ANY profession using SU (and hoping to not lose money) will not be just picking up SU once a year to use it to create something meaningful and require prompting (by button images etc) what a command does. With that little amount of regular use of SU they would almost certainly not be able to build a meaningful model within the allotted fee-based timescale. No, they’re way more likely be using SU as part of their daily/weekly workflow and as such they know exactly where the commands are and what they (mostly) do so don’t need prompting. SU appeals to (or at least is aimed at by Trimble) mostly professionals who, by definition, have a certain level of competence and understanding of the software they use, or they simply wouldn’t use it. And therefore they don’t require cartoon graphics to remember where the commands are or how they work.
As I said before, none of this (to me at least) is an argument on any level. It’s merely a detail at best.