i will admit it is frustrating for some. let's look at things in terms of maybe the last 3 years?
someone may instruct for 2 years while flying part 91 charters on the side? or they instruct until they can get a cargo job? well then these folks find themselves in a 121 ground school and the person sitting next to them starting flying 3 months ago, shelled out $70K and still has their temporary commercial.
it is frustrating. i can assure you.