Yes I agree,
Like I said this was something I thought about when flying mainly old wood and fabric gliders. Machines such as Blaniks, K6/8/13's ect ect all spin very predictably and can be recovered within a turn or two at most. If the cloud base was over at least 1500 agl (pref more) I would have been happy to spin ... well, maybe "happy" is the wrong word but you know what I mean
Powered aircraft tend to spin a bit more erratically and recovery is often slower, especially after several turns. Also glider spins are very benign and you'd have to be very sensitive to become disoriented unlike a powered aeroplane. The whole point was that if you were likely to become disoriented at least a spin is a known flight state that is safe and if intentionally initiated then recovery should be pretty straight forward.
I wouldn'd seriously suggest anybody does this ... but in the context of this discussion, and bearing in mind the nature of gliders, it was something to ponder
SS