A student asked me a really useful (and common) question the other day.
I've gone through your speaking answers, and I rarely found linking phrases like "I suppose I should begin by highlighting the fact that..." or "the point I'd like to begin with is that...". Don't you think such phrases are the sign of a high score?
Here's my answer:
Good question. No, I don't use those phrases because examiners are not impressed by them. Even a beginner can learn linking phrases, and if it were that easy, everyone would get band 9. The sign of a high score is 'real content' (topic-specific vocabulary), not memorised phrases.