We find various rabbis in rabbinic literature who built their spirituality through fasting and depriving themselves of physical pleasure. Rav Kook explains that this is like "shock treatment" or bitter medicine, which healthy people don't need. In Torat Eretz Yisrael, the Living Torah most applicable to the modern world, the approach of unity is to reveal the harmony between the physical and spiritual worlds. In Israel, where even the physical is spiritual and the atmosphere is Jewish, it's much more conducive to living a life of modern orthodoxy without the dangers of losing our proportions, priorities or getting influenced by western society. Accordingly Rav Kook explains the machloket between Rava & Abaye in Masechet Shabbat.