These maybe true of the Highland over the 2023 3 but many of those improvements have already reached (at least in part) Model Y. Laminated glass, for instance, is already on the front windows in Model Y (just missing off the rear windows now). And specifically WRT to motors, I believe those are the same.
These threads feel like the people who aren’t buying this year’s iPhone because there’s a new one coming out next year…but there’s always a new one coming out (and the differences are always less than we think they’ll be). Unless the release is imminent, I don’t see the point in waiting.