I'm not sure how that implicitly conveys an opinion.
Saying "the sky is blue" is not an opinion when the sky is blue, it's a fact. Saying something is better is also not an opinion, it's a fact. Saying "in my opinion" or "I believe/think/feel like/etc" makes your statement an opinion, ommiting that is ambiguous and is left for interpretation.
I'm not sure how that implicitly conveys an opinion.
Saying "the sky is blue" is not an opinion when the sky is blue, it's a fact. Saying something is better is also not an opinion, it's a fact. Saying "in my opinion" or "I believe/think/feel like/etc" makes your statement an opinion, ommiting that is ambiguous and is left for interpretation.