What is "Yomi name"?

You are correct, the culture settings should not remove anything. I person in the US may know someone from any culture. Adding the ability to choose what is displayed would be a difficult task. Not so difficult but it would add a few issues.

I would use the feedback button in settings, or if you have windows 10 use the feedback app from the store. I would request a feature to add a limited details, speed screen and full screen. The speed screen you could choose which items to display.

I for one make use of the Yomi quite often.  (UI Language: English US).

I know plenty of Japanese people, and when addressing mail and documents, it's nice to actually be able to spell their name. 

I used to use the field backwards:

 First Name: Hiroshi 

 First Name Reading: 宏

Though, now that I'm more comfortable recognising people's names, I have it now the Proper way, but with reading latinized: 

 First Name: 宏

 First Name Reading: Hiroshi

(the "expected" value would be "ひろし")

But then, I also do the the same with Chinese.  Placing their name (in foreign script) in the field, and set the reading in Pinyin, and the name they go by in English under Nickname

 First Name: 李安

 First Name Reading: Lǐ Ān

 Nickname: Leon

People have to remember that many people do have international contacts, and being able to not compromise a hack to enter Contact Information (such as mis-using fields, or just throwing multiple values into "first name") is very very nice.

This is one thing that I wish Google products were able to do more easily, but their world is very English Centric, and other cultures need to wedge into their developer's world; as opposed to Microsoft which used to very heavily take local standards into account, and make them available worldwide, Because if I move to a country, I still would want to use a English Interface and application, but be able to enter all the fields needed to efficiently work in that region (Such as having the Japanese specific fields available in English). 

I've seen the gamut go by.  First, the fields were provided untranslated.  Good that it's exposed, as if you know what it is, you can use it.  But looked bad.    Then, they translated it.    But unfortunately now, they are going back to the "one format for all" which is admittedly easier on a software coding level, but does do away with all the very detailed regional formats that used to be readily accessible (but a stupidly long list), in favor of "It more or less works."   (Ie: Now one needs to use "Middle Name" rather than "Otchestvo" (Patronym) when entering Russian names.

I agree with Company 2 or Entity or Entrepreneur or Employee.  Yomi?  Do they utilize healthcare staffing agencies in the US?  Possibly, so on the other hand I opt in for a yomi name and yomi company. 

First time I didn't see spanish equivalent.  A nice change and every has some credibility or usefulness to someone.  so I definitely agree with Yomi Company if it will generate exposure to another country that would utilize my firm's services.  I will see and play with it if it frustrates one it may be indicative "being too busy" and not "present".

Oh for goodness sake!  This yomi business is simply nonsense.  (Even as I write this text in the reply box the word "yomi" has a red squiggly line under it indicating the Microsoft's own spell check doesn't recognize it!)  I too queried the term after bringing up HELP from being in my Contacts, "People " page and it wasn't even recognized.  For all of us, Japanese extraction included, who live in the grand U.S. of A. this term is nothing more than distracting and a waste of programming space.  It needs to be eliminated from the context for users in the U.S.  It's pandering to a teeny weeny minority in the name of foolish diversity.

And changing "Contacts" to "People" is so lacking in descriptive value that it's juvenile.

"Yomi" isn't an English word and therefore won't be recognized. "Yomi" is Romanized so it's easily understood by everyone and doesn't require installation of language packs, etc. It's definitely not juvenile, foolish, or unnecessary. It appeals to a wider audience and expands beyond the USA, just as the company does with all that they do.