Maybe crazy: Any reason to buy a plain Blu-ray player?

[KublaiKhan]

It may be an ignorant question, but is there any compelling reason to buy a plain Blu-ray player as opposed to a 4K UHD Blu-ray player today?

 

[Dark Lord of Tech]

I have a 4K player now , that way I can play both.

Needed it for my new 4K Vizio TV.