Pillar is the only guaranteed starter in the OF, isn’t paid very much, has only just turned 29, has been worth 9.5 WAR over the last 3 seasons, and is projected for 2.8 WAR this season.
Giving him away in a trade would be incredibly bad roster management.
Now if someone offers a decent return (e.g. a MLB ready starter +) then absolutely consider it, as once his defence goes he’s worthless. Realistically I don’t see anyone offering that, so his value is greater to us by staying.