Yes...cleaning carbs (or removing them) is not as difficult as it looks...But if u split the carbs, (like I did) u will have to balance them as well as cleaning...probably not a bad idea to do anyway...
I'm making a MONOMETER to do the job...just waiting for a few bits from ebay...can't wait to try it...and see if that finally clears up all carb issues...
You're right of course, but it's a damn site more difficult than pouring liquid in your tank for the less technical person.
Reason i use STP is because i do a lot of short runs in traffic, so it's ideal to use just once a year to clear any built up deposits.