I completely disagree. Major cities all have English signage now, especially for transportation.
I would say 95-99% of transportation signage have English translations. There's still the remaining few percent where it's entirely in Japanese (source: visited the Kansai region a few months ago). They're usually signs on the ground on whether a line is express or non-express.
I ended up on a random bus in Sapporo once and it was the only public transportation without English signage or announcements in multiple trips to Japan using multiple public transportation systems.
a quick view on YouTube of a current travel video in 札幌 Sapporo, Hokkaido region, showed the transit machine, and one of the choices was English, also Simplified Chinese. The signage at the entrance to the station had a line of English name on it.