I guess I can see the value in accurately being able to slow things down, and it is more possible than I figured.
I'm not sure it is helpful to do so for people who haven't felt the chain actually work with momentum though. I can see it being more confusing to some people (like me if I try to empathize with my more noobish self lol).
Yeah, it's another one of those "depends on where you are and what it's for" tools, I think.
Like seedlings and SW and Jaani are saying, being able to stop stacked and balanced all of the sudden in a continuous move gets weird once your body mass & stance cover enough distance. Some of it is the details of the action, some of it is pure momentum effects/their unity.
RB, like you're saying, I also think my slow swings became even more useful after figuring out where power from momentum and swing "tension" in the body comes from, e.g. especially with some door frame drills, sledgehammer throws, and progressively bigger Hershyzer and Ride the Bull. Big, "meaty" movement of the body. So I relate to what you're saying there. A lot of the chain is actually "reactive" to adding momentum, so it can get easier to get more mileage out of slow swings once you start connecting with those moves and feelings without overthinking them, I believe. It gave me the insight that you can actually do a lot with tiny bits of momentum if your body is sensitive enough to it.
Specific places I've found slow swings super helpful, especially while recovering from a few body issues again the past ~2 months or so. Won't be the same for everyone but a couple potential nuggets here:
1. "Academic": pure analysis and understanding basic mechanics & the role of momentum as has been discussed above. When I watch what happens in Hogan's slow chain, it's important to notice how similar a lot of the posture and sequence can look in anatomical terms. Then, in a real drive slowed down, I see all that body action with a sudden abrupt shift, momentum of the arms pulling him taut against that sick shift, all that good stuff. I just frankly find it fascinating so it keeps me engaged. It also helped me understand why RB and Sidewinder and Jaani and Sheep etc. basically share aspects of "freewheeling" swing theory in common. I'm sold on any consensus to be found there, fwiw.
2. Practical: Once I started getting mAss leading more, I think my swing is becoming as smooth as it is because I usually would work back up from 50% or slower in general, often right after a minor injury somewhere from pushing something too far too early. Sometimes going ultra slow like SW's perpetual drill or literally Hogan with golf club helped me find little hitches and kinks that I can smooth out over time. It has been saving some of the body tax as a result. Definitely helped me get more sensitive to "stacking" and ground pressure and stuff that has protected my knees in the last few months.
3. Practical: Taking it slow, then gradually adding momentum can make you feel the transition between the sub-throwing acceleration and throwing acceleration, and made me way more sensitive to all those cool "reactive" dynamics the body does when you add momentum. I had such poor body awareness starting out that I think this has been an important long-run payout. Also, my upshots and midrange drive precision and accuracy started getting dramatically better in the last few months even with a few mechanical issues, I think in part because my tempo mastery is suddenly getting much better. Kind of feels like a snowball effect. Helps pursue that "be the disc" feeling mentioned in the other thread and keep massaging it into my uptempo/momentous drive practice.
4. My preshot routine makes it much clearer how slow practice pumps and walk throughs relate to setting a shot for the much more momentous swing. I used to be super body confused when I actually moved to tee off, but way less recently.