This must concern some paperback English print? My copy in French from "Editions MIR Moscou, 1969", hardcover, masterfully typeset and in bible paper is one of the finest books that I have.
Yes, I think it's specific to the English version. You can see examples if you use the Amazon.com "look inside" feature. For instance in volume 3, in the first pages already some of the footnotes are hardly readable.
For one of the volumes, a reviewer even posted a picture of his edition with subscripts printed so faint/partially that they were basically missing, and he had to Google the proper formulas!
Yes, I literally have RF engineering books (interesting reads actually) that are as old as my grandfather that have clean equations and beautiful text, in a lovely binding, but my L&L copies are both like an n-th order photocopy.