Thanks. Advantage of change is more liquidity on bid and offer. Disadvantage is bigger spread.
I think this change seems to favour market makers.
high-frequency traders like tiny tiny tick size.
elderly folks don't like it.
look at jpy futures.
I can't tell the difference between
0.0000937600 and 0.00000937600
not all charting software and trading platform
are elderly folks friendy.
not all of those allow us to make the tick size coarser or
reduce the number of digits.

I see that all the time around me