I don't need/want them to talk constantly during the artistic portions, but I didn't really feel informed about what was happening.
I tend to like a balance. The main part of the opening ceremony is a representation of the host country's culture and sometimes it's so different (if talking about US audience en masse) that you really feel lost so a bit of explanation helps give context and yet at the same time if there's too much talking for the purpose of explanation you get taken out of the ability to just watch and take it in. For Italy I felt more people can connect artists, ancient history and opera even if one doesn't explicitly know who such and such is.
And during the parade of athletes I really expect them to talk more about the countries and the atheletes
That was I think a deserving criticism because one of the commentators, by coincidence I think, had visited multiple of the countries and so it ended up feeling like an uppity travel vlog than a chance to just give a snippet of what is a feature of the country.
That said I give two considerations here:
1) Countries that had very few athletes there so their walking time was very short. It doesn't take long for 4 people (sometimes it was only 2 people) to walk (and only 1 or 2 of them being the athletes competing)
2) The different locations with the athletes walking in the different locations presented I think a production limitation as they had to switch quickly between the feeds. Sometimes there's really only seconds to give to talk about a country as they are walking before another country is coming in.
I know it's normal and all, it's expected, but I really could do without the going to the US group of athletes before it's their turn to walk much less multiple times. I think going to Jamaica is like the loving inside joke so that didn't feel like any harm but I don't need to see US just standing there in a group multiple times before they walk even if they did a split screen presentation so you could still see what was happening live with the other countries.