I do not know what official stance is but I know what my stance is: screw "museum optics". The church is not a museum, nor it is an attraction for atheists to go to to see art, it is house of the Lord. The art is an expression of faith in God, it has transcendental value. If you do not believe in God it is curious you want to see sacral art in the first place. But whatever. People can go inside, they may of course contribute to church repairs whatever. They may see the art for all I care
BUT! when I see boards with "explanations" everywhere, the corridors made for "visitors" in the church I literally feel anger and think all that crap should be thrown out, just like Jesus drove the money changers from the temple. THere are few churches that literally seem to be a caricature of a museum in my area. Visitors have no grounds going there when there is a mass yet they often even do that.. The church should stay church. Making it into a museum because "muh tourists" "muh shekels" equals to making it a tourist attraction.
I am aware there are churches that maintain this in dignity (no stupid boards, no allowing in tourists during mass, no _corridors" etc.) but if you've been to a place that makes it into a tourist attraction you know that it is essentially insulting God.