I suggest this for 2 reasons:
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Being able to defend yourself a little bit when knocked down is very needed, and should be a viable option rather than just dropping a grenade, which is counterproductive to trying to heal. Incapable of using it when you are actively healing.
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At least on Console, pistols are very rarely used. This would actually give a reason to carry one. In addition, I think it would go well with the smarter AI that the devs are pushing for.