I never said WotC was incompetent, just disorganized...
It does seem pretty strongly implied to me, based on the bolded stuff below..
The question is, Why is it still my eyes?
WotC is skipping an integral part of the design process, and one that they recommend you do when designing your own powers, when they fail to make a basic comparison between powers of different levels.
The problem is made worse when you consider how build options narrow the field of comparable powers. Its less important for Dragon Magic powers to be consistent with Cosmic magic powers, but two Storm magic powers should always be compared side-by-side.
This isnt an error of subjectivity either. There is no debate over how valuable the slowed condition is vs dazed at a given level. We arent worried about burst 3 vs burst 2 and a die of damage. It literally is a case where a simple spreadsheet that lists all the attributes of a power, a tool that should be step 2 or 3 in the design process by now, would clearly show the error.
However, that's really neither here nor there.
You sound rather sure of the fact that there is absolutely no possible good reason that WotC could possibly choose to balance the powers the way they have, so therefor it is an obvious case of "disorganized".
I think your stand sounds quite presumptuous. It's possible you are right, but I think it's possible there are good reasons for the choice.
As it's pointed out many times already, you aren't likely to be replacing your level 25 power with a 29, but a lower level one.
Secondly, this has happened in older D&D games too. You may find a higher level spell that really close to being the same damage as a lower level spell. One could easily dismiss it because of that, but then again the damage type might matter more than the damage probabilities, and having another similar effect might be useful as well.
For example, are feats that affect Acid damage as numerous or as good as feats that affect Fire or Thunder damage?
I can't say what their reasons are, I'm not going to assume that there possibly be a good reason simply because I don't know what their reason is.