What's so difficult with Gbyte units?  The coin's value is btc/gbyte, you'd end up dealing with larger numbers using MB and smaller fractions of btc when trading... and some exchanges  have a minimum btc value for trading, (Trex is 100k btc sats) minimum per trade.

But if this is changed to Mbyte, where right now 1 Gbyte = 0.05 BTC,   

Then

1 Mbyte = 0.00005 BTC


Why is this better?