Barring a monster surge - or the location already having a seal, which a smart player will place in the most common gate spawn locations, meaning you’re likely to go increasing numbers of turns without gates. More gates typically spawn in my Eldritch games than in my time with Arkham.
Also there are plenty of mechanics that make Eldritch harder than Arkham - lower dice counts with the same success mechanics, clue tokens being desperately needed for mysteries rather than rerolls, investigators being permanently eliminated the moment they run out of sanity or health, just to name a few.