keepCurrentZoomLevel in general is a nice option.

But think it would be even better to have a middle ground. Eg only keepCurrentZoomLevel if the current zoom is between say 13 and 18.
... so if below 13 (zoomed out) would zoom in.
... and if zoomed in beyond 18 it could zoom out (assuming maxZoom was set to say 16)

This would give best of both worlds? If the user is zoomed way out (say country level) then it would zoom in to show the proper position. But if they've already set to a nice midscale, it would keep it, rather than switching to the exact option the developer choose.