I'm not sure what you mean by menial coding but all my employers have supported this in the past. This was a variety of companies, big tech, startups, etc. I think its more likely your employer is the outlier.
Thats my experience as well. Of course not ten paper a day but some learning is always encouraged.
One company had a +1 day. You worked 4 days, had 1 day for learning - everything relevant for the job was fine.
I’ve been scolded for reading books and documentation for the tasks and software I was asked to build (at a startup) during my regular work hours
No company I’ve worked at has ever had dedicated time for reading papers or articles
Maybe I’ve only worked at outliers?