I agree, but lots of folks are making presentations of this style because it's expected of them and they don't have the power to rock the boat, like the sibling

I agree, but lots of folks are making presentations of this style because it's expected of them and they don't have the power to rock the boat, like the sibling comment about Beamer. Those folks still deserve good tools. History and momentum is part of it, but the other part is the value of the slides when viewed later. There's an inverse correlation between the usefulness of slides and the quality of the presentation! Best I've seen is low-text Google slides with heavy speaker notes included, but that's more work and prep than most people are willing to do (myself included).