Yes, i definitely believe that spiritual growth also causes a lot of physical growth and allows you to see a lot more external results.
The physical and the spiritual are ofcourse extremely connected, so the way i see it by combining the two you allow yourself to grow in two completely different ways at the same time.
While im sure i would eventually see similair results as far as physical growth goes if i just stick to my alpha stack for a long time, imo its a lot more beneficial to approach the issues i may face from multible directions rather than keep trying and forcing the same approach.
But this is only a small part, the goal with spiritual subs is more to become more authentic to my true self and let go of everything that doesnt serve me. On the other side, with the alpha subs the goal was more in the direction of confidence, girls, etc. To illustrate what i mean with what i said above, ill say, with spiritual subs ill naturally become more authentic to myself, wich as you can expect also makes me more confident. This in turn allows me to have an easier time with girls. When i than will run WANTED afterwards, itll have a far easier time fully expressing itself.