3) He is a real autocrat, he never asks about our opinion. These are somewhat idiomatic (using 'opinion', 'feelings', 'druthers', etc). They are essentially synonymous.
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Reegis1) To ask something= ask a question
Reegis2) To ask for something= request an item or an action
Reegis3) To ask about something= to request information
Reegis1) He is a real autocrat, he never asks our opinion.2) He is a real autocrat, he never asks for our
ReegisAre they also idiomaticI am not sure that 'idiomatic' is true. I just know that sometimes they are synonymous and other times not. Above, your 2c is the odd man out, for the reason you have given.