There's nothing wrong with "vanity" folders - it helps keep a specific vendor's products organized in one place, and only a handful of people seem to have a problem with it. How is a vendor supposed to know what other vendors are naming their products? Without vanity folders, it's extremely likely that a new product will overwrite an existing product with the same name, and then you'll really have people complaining. 

Your argument boils down to:

"Everyone needs to keep training wheels on their bikes because a couple of kids don't want to take them off."

Any time someone brings up runtime organization, those of us who would like a bit of rationality are shouted down by the All Hail the Poser 4 workflow crowd AKA the Luddites.  As the customer, I don't care who the vendor is that made a product.  The only place I should see an ego folder is in the Geometries folder or the Texture folder.  If a vendor puts an ego folder anywhere else, it slows down the use of the product.

As far as naming a product - apparently vendors aren't smart enough to name their product .  Ego folder goes away, identical naming issue goes away, and the vendor can still stroke their ego by having their name in the product without hiding the product.  OTOH, these are the same folks that name their material pose files MAT_foo1,  MAT_foo2, (which renders the Poser search function useless.)  God forbid a vendor do something to make their product easy to find.

If you don't have a lot of content, then an ego folder isn't an issue - those of us who spend way too much money here have 1st world problems (i.e. 500+Gbs of runtime content).  I wrote this in 2013 when talking about ego folders - it still applies today.....

Allow me to show you what I, as the customer, have to deal with every single time I fire up Poser........

I decide to make a render.  Load Figure (it can be any figure).  Figure needs an outfit.  Go to the character folder to add conforming clothing - Am I looking at clothing?  No, I am looking at 100+ vendor names (aka ego folders).  Now I have to open EVERY SINGLE ONE OF THEM until I find that dress I am looking for.  If I am lucky it is just 1 ego folder, if I am not, I have to drill down yet another level - for every single vendor - and yes, I have a number of products that have ego subfolders inside of ego folders.

 Ok, now do I like the default material?  If I don't, I need to change it.  Now the real fun begins.

Did the vendor follow Poser standards and make .mc6 files and put them in the Materials folder?

If yes, then I go to the material room - I am once again confronted by 100+ vendor names. No problem, after all I know the vendor name from rooting around in the character folder, right?

No.  Because I tend to buy a 3rd party add-on pack to stretch the value of the clothing item.  Now I have to root around in 100+ vendor names individually, until I find what I am looking for.  And yes, I do have to open every single one of them, because most vendors that make add on packs are not smart enough to name their products <add-on pack> for . And then there are the vendors that use differing folder names between character and material and/or pose folder.

 If the vendor continues to use .pz2 materials (a hack for Poser 4), I have to do the exact same thing in the Pose folder.

 If I am not for sure, guess what?  I have to do it in BOTH folders, because vendors can't follow the established, 8+ year standard.

 Rinse & repeat for EVERY SINGLE ITEM IN THE SCENE.

Please explain what is so damned hard to understand about having MATERIALS in the MATERIALS folder and POSES in the POSE folder.

With the exception of the .mc6 issue, everything I talked about earlier applies from at least Poser 5 forward. 

It's 2014, let Poser 6 go already.