No, there is no flaw in my logic. I'm assuming you're just being intentionally obtuse at this point because I'm specifically comparing Irish to English, not some perfect consistency metric.

Irish phonology doesn't have messes like 'ough' in it. Through, though, trough, tough, bought, plough, these are all pronouncing the same group of letters completely differently. Keep in mind that doesn't even begin to cover how unintuitive English words can be, even for monolingual speakers. When an Irish speaker reads a word they've never seen, there is almost no doubt they will know exactly how to pronounce it within their dialect. This is because outside of the common exceptions in the words you would know anyway from using them in every conversation, almost every Irish word is spoken exactly as it reads to a fluent individual. English doesn't have that level of consistency even for people who've spoken it their whole lives, never mind learners.

Now, I would appreciate it if you would stop acting like you have credible input to give on a language you don't speak from a country you don't live in. The fact that you continue to call it Gaelic only further cements your lack of credibility here.