It really depends on the bike. For around town, neighborhood, along the beach I converted both my old bike and my wife’s to a flat bar. We both have other drop bar bikes.
For me it really helped improve my old Cannondale. The steering always seemed a little slow with drop bars, but now it seems quicker. I’m running 42/30 chainrings and she has a triple mtb crank. Perfect use for the old bikes.
John