That is wrong.
According to the documentation it is very specific to the ESP32 and if you read the datasheet you will see why.
Other ESP32 processors like the S and C devices do not require it.
The rest of your AI generated info is also mainly wrong or misleading
Thanks for letting me known. I've deleted that post as to not mislead anyone with incorrect info. Admittedly I do use AI for a lot of stuff and incorrectly assumed it was correct 
Yes it seem the docs do say that as per:
[I2C - - — Arduino ESP32 latest documentation]
To be brutally frank, it's sad if you have to rely on AI to tell what what to do or what is wrong and what is right.
There are probably hundreds of forum posts involving AI generated code that does not work, so most knowledgeable people here are not big fans of AI
Like your post, it's easy to spot because it's usually just a bunch of long winded gibberish
Why two boards, cannot one board do all the work?
What is the project?
Tom.. 
I get what your saying, but I'm a novice with coding, only started a year ago. Sometimes I can spend hours on forums trying to find what I'm looking for and the examples are small snippets of code that don't make much sense and hard to make use of. Over time with experience things will get easier, but for now I'll use whatever tools are available to make things easier, sometimes AI can really speed things up and help. Yes it's far from perfect and in it's infancy, for now, but I have learnt a lot using it.
As mentioned, I'll be using an ESP32 LCD display (the yellow PCB version) to display data, but has limited spare pins, so I'll be using a second PCB that does all the data collection from sensors (RS485, RS232, ADC, GPIO expanders, etc).
Can't argue with you there but you really need to take AI with some measure skepticism and never assumed it to be correct.
Anyway you have it working so have fun!
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