And between 0.00000123, 0.000123, 0.0000123 you are sure which one is which without effort?

I can't

When they’re aligned vertically, say as part of a table, then leaving the zeros in makes it much easier to read.

Not sure.

Check http://cryptomarketplot.com/accessible-index.html : the numbers are also aligned, and in less space that it would take if 5.744e-5 was to have all its leading zeroes.

Within each section, right now, the exponents remain the same. I’ll concede that when that’s true, the choice of notation is irrelevant.

However, occasionally, prices will straddle a boundary between 1.9eX and 9.0eY with |X - Y| = 1. In those cases, the different exponents will be easier to miss than the different number of digits or different number of leading 0s.

I would argue that in this case, the big change from 1.9 to 9.0 would catch your attention even more than the change in exponent.

But by the same login, I agree with you: .9eX and 9.0eY with |X - Y| = 1 may cause too much focus on what is a small difference.

Some hard choices were made. It is not perfect.