Not possible to choose primary phone numbers without specific address type

We have noticed that it is not possible to choose the primary phone number in a profile:

As you can see in the screenshot, it is necessary to choose an address type as well.

For example: Creating an individual search view with the primary number is not working. If I choose address type "Mobile", only primary numbers of this type will be shown but it could be that other primary numbers have i.e. the type "Work".

While with e-mail adresses I have this option:

There I can choose just primary and I think it should be the same way with phone numbers. So I am wondering if there is any reason why it is different with phone numbers? Thanks in advance for any support!