In old school trend following systems Donchian channels, "x" day highs, BB band breakouts seemed to have been the norm.
It seems to me that PSAR accomplishes the same as the above indicators as an entry notification. Maybe it is visually more pleasing , maybe a little ealier than the others
(Depending on its parameters) to inform that a pullback in trend may be complete but,
any testing that i did with it in the past came out to be roughly 40-45% that works in bull market and probably doesnt hold as long as one should in a bull market.
I think the only value it has is to ring the bell that a lengthy correction is at least
bouncing, chopping ,bottoming and is worth watch list.
Plain Vanilla off the shelf indicator?