Hi Russlad, welcome to OSM.

May we know the reason behind removing several mapped trails and paths?

If a path or trail is private, it should be marked as such and not removed. Furthermore such objects can be mapped on OSM with no issues. See the following wiki pages for more information: https://wiki.openstreetmap.org/wiki/Why_we_won%27t_delete_roads_on_private_property
and https://wiki.openstreetmap.org/wiki/Why_can%27t_I_delete_this_trail%3F

The best way to indicate that a path or road is private is to add access=private. The mass removal of features that are present on the ground is not acceptable.

More details about this changeset can be found here: https://resultmaps.neis-one.org/osm-change-viz?c=159972801

Thanks!