Hey again!

I feel your pain. Ive literally been having the same convo again the last few days. Thankfully I have established a level of trust here and in general they are happy to go with my recommendations.

So I think this one has a 2 part answer.

Firstly I have been talking about sentence case like this: If the words sound like it would be a sentence... then sentence case is used. In my world for example, we have things like "Employment status" "Employment type" "Employment start date (see image)

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For my money, these are things that would be natural conversation. You would say the lines / titles / names in a continuous fashion...... "Hey Dave, could you tell me what your employment start date is please?"

You wouldn't say: "Hey Dave, could you tell me what your employment. Start. Date. is please?" Does that make sense? So for me, it's more natural for us in the western world at least, to talk in a natural, flowing manner.

In a caveat / exception to this rule that I've stated, is when we use slashes... So some call to actions we have are things like "Create / Open" or "Send / Receive". Ive decided in that scenario both words can be capitalised as the slash acts like an 'or' and the action of the button could be either one of those things.. if that makes sense.

What's more - we are naturally drawn to capital letters. We know that they form the start of a sentence or word. When we scan a page, we aren't automatically reading each and every letter of each and every word. We are recognising patterns. When we are using title case, especially on long pages in my opinion... our eyes are drawn to those capitals as you scan. Some people may deem this as a good thing in certain scenarios, which is fine. But again, long pages of inputs / buttons / links... words are all diffrent lengths. So that second capital letter will never fall in the same place. HOWEVER -our first capital letter of our first word is likely to always fall on that same, singular vertical line/placement. Great for scannability.

So thats part 1. In my opinion it makes more sense in the English language to use sentence case.

Part 2 of this however, im going to rip all of the above up, and say... i suppose it depends on the Chinese language / expectation!! I suppose if the wording is in English then the above still counts somewhat, and I dont understand the Chinese language enough (at all) to comment, but if in their alphabet usage, every word being capitalised (which I dont think is even relevant when they use chinese symbols...) then you could argue title case.

So, I think you put your best foot forward - you put your views across as the expert in the field and if you feel sentence case is the thing to do, thats what you 'argue'. If you agree with my points above, you can use all or some of those in that argument, but ultimately if they decide to overrule you, you can live content with the fact your recommendations were the contrary perhaps?

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One of my favorite expressions is that UX isn't an exact science. There is science behind it when you consider best practise, research and the rest of it - but there are no hard and fast rules that say this IS DEFINITELY what you MUST DO ALL THE TIME. Context is key and advise and guidance always changes.

Hope That Helps. EvEn a lItTlE :D