The so-called restorationists should go visit the new churches in Poland.  Granted,  very few were allowed to be built by the Soviet occupiers, but those few that were represent very contemporary architecture (this while JPII was Primate of Poland as archishop of Krakow).  It is even instructive to visit the chapel at the Catholic University of Lublin (where JPII taught philosophy).  It is breath taking in its sense of the sacred, but very very simple and very, very contemporary.
To see just one of the very fine post- Vatican II churches, one might visit the Church of the Visitation in Kansas City..  ( I don't know if it was new construction,,,which it appears to be...or a thorough remodeling. In either case, it is wonderfully apt to celebrate the liturgy as envisioned by Vatican II,  has a real sense of the sacred and beauty which touches one's senses and soul.