The problem with just 'like', is that it helps create an echo chamber. It also still brings 'emotion' with it and a lack of transparency as to what it is you 'like'.
I get what you mean, but it also meaningful in a group dialogue to show who (and how many) agree(s) with your posts.
If someone made the best post ever (unlikely to be me!) then there is no real feedback that shows that is the case… the people most likely to engage with the post with a response are people that disagree with it. There’s often not anything to add when you agree with someone that’s well said… and I think people would rather a ‘like’ than additional posts saying ‘good post’.