I find it funny whenever I have to point out that Brokenlens is actually using the 1.9 combat system for Win10 players for years already.
They do have a cooldown, the faster they hit, the less damage they will do.
On top of that, on every platform, hits will only be registered by the server after half a second has passed since the previous hit. or in other words 500ms. which means 2 cps tops.
These measures have been put in place a long time ago because this Windows10 topic is really old.
And even though PE players are never happy, the PvP system on brokenlens is quite balanced as it is, we've managed to find "a sweet spot" a few years back. and we don't intend to change it so soon.
The damage a player can do to you depends a lot on which tactics they are using. independent of their platform.
You can check this for more info on that:
https://brokenlens.xyz/forums/threads/knockback.105369/#post-811565