@Whitecar
I don’t often agree with Joseph, BUT I shall take up the first part of his post.
I was President of an OU synagogue that had an open parking lot 7 days a week. The Rabbi did not object, as long as he had a minyan of shomer Shabbos members, the rest could do as they wished. They made up the bulk of membership and paid the bills. He was not a YU type, but from a major Brooklyn Yeshiva and an honoree of the Agudah at their annual dinner in NY during my presidency.
His father, was Rav at another OU afilliated synagogue in CT and they also had an open parking lot.
Here in the country, most Jews do not live within walking distance of shul and many drive. Even the area Chabad shuls don’t chain the parking lots. My local shul is an OU member. We chain our lot, but most of the members drive and park at the church next door. The church members use our lot for overflow parking on Sundays which are not Yuntif.
I can not speak to the OO comment as I have no direct knowledge of that.