Giving them a choice is perhaps a good option in this case, @Inna22
I could set my home for self check-in only, or both. But I don't. I selected the "hosts will meet and greet you upon arrival" box. So they already expect that they will have to see either me or my boyfriend when they arrive, so it's not an option. When I can't, we send the self check-in instructions, apologizing that we won't be available. I do this because I want to see who's staying at my place.
But not only that, I noticed the same as you assumed before: I get amazing, 5-star warm reviews when I great the guests personally. Every time. They mention the personal greeting as the cherry on the top of their check-in experience and can't stop giving us both personal compliments. I've got guests leaving me flowers multiple times and heart notes of 'how nice' I was to them. In contrast, I noticed that in most cases (not all but most) when I don't check them in person, they don't leave a review at all, or end up giving 3/4 star reviews in the check-in option, or the extreme version for example, that 'there was not enough toilet paper: overall 3 stars' (I live on the floors above so one message asking for more toilet paper would have been enough).
It seems to me that when they meet me they feel like they can ask me something, or even as they know me for some reason. They get personal and very thankful for ' letting them stay here and my hospitality'. I think it really adds to the human side of Airbnb for some. But I guess there are other kinds of people in the world, so try to filter them beforehand, so you know who you are dealing with 🙂