True, but sometimes people are unsure if something else should be accepted, as I believe was the case here. I think the above information will be useful to people in future.
But yes, of course you are correct that one should avoid filling the discussion with suggestions for alternative translations.
In traditional English grammar it is not necessary to repeat the subject in this case because: -the subject is the same, "I"; -the two sentences are united buy a coordinative conjuction (and, or, but); -the structure of both sentences is simple enough that no doubt can arise about the subject of the second sentence. Decades ago repeating the subject would have been considered a grammar mistake. I'm not sure about contemporary teachers.
Generally Duolingo starts out teaching the present tense of verbs, meaning that something happens now, and your answer in English was in past tense (conveyed that something occurred previously). The words I've italicized are examples of the two tenses in the respective parts of the sentence, even though it is actually an answer to your question.
I've been tripped up before by sentences that I would rarely if ever utter in present tense.
Yes, I, too, have trouble distinguishing that terminal 'm' from 'n;' however, in this case, you know it's 'Ithim' and 'ólaim;' because, if it were 'Itheann' and 'ólann,' then there would be a noun or pronoun following (e.g., 'Itheann sí,' 'Itheann Pól'); since you do not hear a word for the subject following the verb, you know the verb must be the synthetic form with the subject 'built in.'
I literally put that in and yet it says I'm wrong, I'm sorry but you really do need to update your irish section, so far I've posted about 3 comments for 5 questions. I've been learning Irish since I was 4, also your Irish speakers are all from either Dublin or down south, you need to add the different locations as an option to learn.
For most beginners, "more diversity" is a hindrance, not a help, so, like the vast majority of teaching resources, Duolingo is designed to teach a single dialect of Irish, though a huge amount of extra work has been done to accommodate people who have learned other dialects, and many different dialect forms have been added as acceptable answers.
But you were mistaken in your comments on other exercises - your other answers weren't rejected because of a lack of diversity in the Irish on Duolingo, they were rejected because they were wrong.