When the Church loses its sense of mysticism, religion becomes mechanical. Do this, and that, and you get this other result, as long as you follow the formula properly. There is no room for surprises by God, passion, or what may be called “romance”.
When the Church loses its sense of Truth, there can be no growth in the Faith, no spiritual progress because you measure progressing against. You have no idea which surprises are coming from God, and which from some other source. There is no genuine “passion” or “romance” in the relationship because there is no solid doctrine, or accurate communication in the relationship. There is no sharing of Christian mystical experiences, because you have no common ground of doctrine, no way to discern if the person is responding to God, the devil, peer pressure, or some other spirit.
We have gone through maybe 60 or so years of drought in doctrine, so we have had 60 or more years drought in mysticism. There are exceptions - think Poland, for instance, JP II - but even in the exceptions, I think where you find genuine Christian mysticism, you also find emphasis on doctrinal truth. And where one is weak, the other is weak too.
When doctrine is solidly taught and communicated, the mystical charism can roam free. People can share their experiences with others who benefit, because they have a common frame of reference. When genuine mysticism is flourishing, there is a desire to learn more about the Beloved, and to share that love. Both those things require - or rather, cherish, doctrinal consistency.