Plus there is the “perception” that not enough scripture is taught in the RCC Church as well. But there have been efforts to get that corrected over the years.
It isn’t just perception. Different polls have shown that Catholics have little Bible knowledge, especially versus evangelicals. See the Pew Religious Knowledge survey, for one. And I lived my first 40 years in a highly Catholic area (80%), and with all the Catholics I knew, they had a lot of knowledge of Catholic practices and the basic Catholic doctrine that was drilled into them, but little to know biblical knowledge. And living among them, having been raised Lutheran (which in my area, meant the Bible also wasn’t taught in church), I didn’t have it, either.
And for the claim that the Bible is read at mass, I would have to look into whether the whole thing actually is, and how much regularly-attending Catholics actually learn from what’s read. Plus, I heard on Catholic radio that daily - versus just Sunday - Scripture reading at mass only began in recent decades, and likely because of pressure to be more like evangelical churches. Then one can ask, how many Catholics attend daily mass? I’ll also add that I read the biography of Mother Angelica, and she only read the Bible *decades* after becoming a nun, on her own, and not because the Catholic church directed her to.