I think the use of adaptive trigger would be a disadvantage in pvp as you can push the trigger faster when you're using the DualShock 4. It would be a nice addition in pve but it should be possible to turn it off when in pvp.
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All games that have the adaptive trigger feature have the ability to turn it off. I also think with practice it could be an advantage since it allows you to be more precise with your trigger pulls with practice. Regardless a pvp, pve option, intensity option and the ability to turn it off would cater to all users.