Hey OP would you rather go back to the ffxi days where NMs were claimed to a party so people would actively compete to be the ones to get it and if you were too slow you had 0 chance to get anything?

If you find a hunt you have every right to engage and kill it, this is not bad behaviour. Sure it's nice to wait for people but your are in no way obligated to do so and if people arrive after it's been pulled they should just be grateful they can still get anything at all, unlike if it was a claim system.