Obviously recently there has been quite a lot of press about the way complex movements can help to keep the brain more active as you age rather than the normal decline that most people experience (maybe I'm over simplifying but you get the picture).. There's been a video on Youtube recently of a guy in his 70's on a balance board and throwing knives which has sparked a lot of interest.
Also the integration of the warm up/ cool down and recovery is missing for most people who stick to a more conventional style.
Obviously this applies to all CST programs, yours included, not just Tacfit. I appreciate you know this already but that is why I would label it as advanced compared to most of the BW programs people here would use (YAYOG, Al K, CC etc), which are hard and will do a very good job of keeping you fit and strong in your youth but lack the sophistication to keep giving you results for years and years. Maybe sophisticated or complex are better words as CC is certainly able to take you to an advanced level for BW calisthenics.