Why Avoid Parry?

[Risvertasashi]

So, where is the source showing all three tanks testing at 0, 100, 200, 300, 400, 500, 600, 700, 800+ parry?

If you were paying attention: bluegartr forums (no I am not going to google for you). It's impossible to test at 0, however. Or any value below the base.