My area has several former box stores converted into churches. They all, from what I’ve seen, tend to be like you describe. Meanwhile, the traditional white church with steeple congregations are floundering with stagnant or declining membership. Of course, many of these traditional churches refused to blame their ideology and teachings and insist that it can’t be a “real“ church unless it’s in a pretty white building with the steeple and not a former Best Buy.
This church is actually in a very old traditional church. I love the stained glass windows along the sides. (The one up front is blocked by the big screen TV used for announcements and song lyrics!)
But like you said, it is the people and theology inside the building that matters!