IMO trying to predict wave 2 is the least useful one of the bunch.Yeah, from a psychology point of view, at a market bottom you have too much fear in the market for wave 1 to last long, so some bearishness remains, which is wrung out in another short wave 2.
I think most logically thinking people without bias would agree with that side of thinking is useful.
Wave 3 has waves 1 & 2 and prior trend/correction to start of wave 1
Wave 4 has, of course, waves 1, 2 and 3 (especially wave 2) for comparison.
Wave 5 has all of the above.
What I've seen over my many years is how few traders use the more important factor in their EW analysis ..... time.