Add Right-to-left language support
To get wide usage of many languages where the writing direction is from right to left, it's crucial to add Right-to-left language support. All big platforms implement this (Example: Microsoft word).
To be more precise, I'm not referring to text alignment but the text direction. I highly suggest you extend this also to the speaker notes section.
At its current form, it would be impossible to use Slides to present in Middle Eastern languages.
Aaron Metcalfe commented
I appreciate the information and advice you have shared. I will try to figure it out for more.