Well, I think you might notice crickets in response to your question due to fear of backlash from various sources.
I don’t do an FTP test very often, because like you, I can pretty much predict the outcome. I’m 49 years old, and have almost 700 TR sessions under my belt over the course of 5.5 years.
Big gains in FTP occurred early on, but now, 5 watt gains are hard to come by. I have seen my fitness consistently have a predictable ebb and flow through the year. In addition, I can tell from how I feel, if FTP is correct for a workout. For example, VO2 workouts (with 3 min+ intervals) for me are typically adjusted down 5%…so I do the intervals at 115% instead of the prescribed 120%. This doesn’t mean my FTP is set too high, as longer sustained efforts are doable, and can even be adjusted up 2% or so. I’m a triathlete, so sustained power is my forte.
I typically retest in the fall before diving into winter base phase. The test gets me started off on the right foot.
Edit: this past week, I substituted Carson for the prescribed ramp test. No change in FTP for me between SSBLV1, and SSBLV2. I’ve learned to NOT increase FTP between those two blocks.