If people who like “modern architecture” like the clean, simple lines, uncluttered look, a feeling of lightness and airiness, verticality, etc., then there is already a style deeply ingrained in Western Catholicism that can satisfy all those requirements very well, and it is the basilican, or you might say the early Romanesque.
It is very simple, the lines are easy on the eyes, the proportions are very good, and it can and often is done in such a way as to be beautiful without a ton of brocade/stenciling/paint/etc.
Google St. Paul parish of Spartanburg, SC. They just had their new church consecrated, and it is absolutely magnificent without being at all overbearing or cluttered.
What I generally hate about modern architecture is the extremeness of it. These architects almost never take a theme or elements and work reasonably with them, they take something and take it to the uber-extreme, and that is grotesque. It’s very ideological and, ironically (or perhaps not so ironically), supremely self-referential. Modern architecture, I would assert, is incapable of being humble in any way.
Simplicity, if that is what is wanted, exists outside of antiseptic concrete and glass.