I don't like to be harsh, but what is the quality of the teachers they are likely to get? A bad teacher can be worse than no teacher. By "bad teacher", I mean one who doesn't understand the material themselves.
> b) More perniciously, the tablets educate in English or Amharic: not in the local language of the population in question, which these children would otherwise speak; their parents are often not fluent in either.
It's a complex issue, but if people can only speak a local language they'll face heavy discrimination if they try to get a job elsewhere.