For $1.35 billion, you’d hope there would be some benefits to Myki. Here’s one: if you take a little care, it can be used from within a wallet. So you need never take it out, unless an inspector needs to see it.
At least once this has enabled me to validate and jump on a train that I would have missed if I’d had to get my Metcard out, stick it physically into the validator, then pull it back out again.
Of course it’s not guaranteed to work in all wallets, but if it’s on one side, and held flat on the scanner (and the same advice as usual applies: don’t wave/”swipe” it, hold it still), and there aren’t any similar cards in there that confuse the scanner, then you’ll probably be in luck.
Hint: Don’t try it out for the first time at a busy station with a queue of people behind you.