I'll repeat what I said a few months back: every sport needs written rules, but no sport has rules that are capable of standing up to the sort of insane rules lawyering scrutiny and loophole-searching that, you know, actual laws receive.
As it stands the fact is that mankading is only allowed in the game because of this sort of unspoken honour code system that is nowhere codified in the rules that means that no one really does it and it looks way out of place when it happens, and everyone sort of agrees to handicap themselves by not exploiting this very plain opportunity opened by the laws to attempt to mankad someone on
~80% of deliveries.
Would it be entirely legal and professional if someone actually did attempt to play the sport
according to the rules to their maximum extent and attempt to mankad at every single possibility? Of course. I don't see how you could argue that it's not within the rules to do so. Would that render the sport utterly and completely unwatchable and make me want to do, oh I don't know, literally any else with my spare time other than watch cricket? Obviously. No sport is ever designed to stand up to that level of "well it's in the rules" level of ruthless exploitation of loopholes.
I don't mind mankading but I think in their quest for internet points, a few people who I won't name but it should be pretty obvious are forgetting what "the laws of the game" are actually for. You need them, but they're necessarily downstream from the way the game is actually played. Cricket is a sport, not a constitutional government.