What is the purpose of spindle with longer non-drive side?

I’ve just discovered that Shimano has 107mm and 110mm spindles in their BB (square taper) — the first one is symmetric and the second one is asymmetric. I have read why BB spindles are right-asymmetric (longer) — chainring clearance — but Shimano released such BB that spindle is longer on the left side (i.e. non-drive).

I don’t get it — all the trouble with clearance is on the drive side, so once you have given length, you make it double. Where is the need for longer left-side of the spindle?