They are old-school because they are lazy about it, not because something is already optimized.
Whenever I hear about how great a Amazon is as a company, I just do a single search and am dumbfounded.
Example:
If you type the name of a product - even when it is in their catalogue - it may not come up.
Search for 'mousr' on Amazon and you only see PC mouses.
The only way you can get to the mousr product is by typing the company name.
It's ridiculous.
Tip of the iceberg.
Ebay's one job is to connect buyers and sellers and they fail miserably at that.
Not even a local minimum, a global minimum. Not a platform, a gated swamp.
Amazon search is in comparison much more... approximate.
Fun fact: we're further away from its first release (2001), than it was from Windows 1.0 (1985).
Remember Windows 7?
We're further away from its first release (2009), than it was from XP.
Hmm, I'll give you a hint. You're looking at it.
I wouldn't call the CL UI ugly. It's certainly not beautiful, but I'm not sure how it could be described as ugly. There's something in between, right?