I had never heard of the 2 space rule until I moved to the US, so this is one of cultural things. I believe "single space" rule is prevalent is Europe and India.
This anyway points that 2 space rule is not "right way" since significant portion of the world (maybe majority of your customers) will think it is weird and be confused about it. The "1 space rule" is more neutral.
This anyway points that 2 space rule is not "right way" since significant portion of the world (maybe majority of your customers) will think it is weird and be confused about it. The "1 space rule" is more neutral.