Maybe because i studied 10/2 before starting this one, i never had a problem with this part and never considered playing the 3 notes with the left hand either.But if you do find this hard and study till you can play it as written, ofcourse it will benefit your technique. But if your 3-4-5 technique is so bad that you cant play parts like this properly, maybe you shouldnt have started this piece in the first place, and start 10/2. Maybe that is a lesson for the next time (or other people reading this): Start the more elemental pieces first, like 10/2, 25/6, 10/1, 25/12 etc.
Thanks for your your responses, but this was not for just technical reasons. If you play the way its written, it may be harder to make a larger crescendo. I have been playing it as written, my teacher plays the first 2 as written, then the last 2 bars with the LH having 3 notes. Also thinking, Chopin's idea of loudness, was probably much different then our perception of loudness today, which may have made him play as written. Thank you for your answers:)