Taiji Quan is not a spiritual path of development. Nobody can develop spiritual and mental bodies via pushing hands, stretching, or relaxing physical bodily tissues. This is as real as trying to travel to explore cosmic space on a bicycle. It is nothing more than wishful thinking and ignorance.
Internal Martial Arts have become a massive online cult attracting countless people to its web. They are not providing anything substantial of value.
In many cases, when unable to prove any martial arts potency, Tai Chi followers say it is excellent for health.
Health - look at Adam Mizner; he is suffering from obesity, baldness, and other health conditions we don't know about publicly. The protruding belly is not normal nor a sign of a big Dan Tien. This is a supposed teacher of many wondrous methods he has been practicing for 25+ years.
Martial Ability of Taiji Quan practitioners = zero
Spiritual Development = zero
Moral development is also terrible as teaching "fake martial arts" builds up false belief in one's martial ability and prowess. It is a classical Dunning Kruger syndrome when people start to overvalue their actual capabilities, ending badly when reality kicks in. Instead of developing fundamental skills and essential self-defense abilities, people develop placebo beliefs and delusions. Investing time and money building a pink and fluffy pipe dream.