True but I'd say this verb-noun idiom only accounts to 15% of the user manual. For instance learning fold commands za will tell you nothing about other commands using 'a'.
Text objects are the core of editing though, stuff like z or all the g commands are more situational. I replace the contents of a string (ci"), delete a word (daw), copy the contents of an array (yi]), etc WAY more often then things like folding
