Responding to critical feedback is a good and sensible thing to do. But ideally you would be able to get feedback on large issues internally, without needing the market to reject your product (Pixel 4 sales have been reported to be quite low): Soli seems so clearly useless, and caused such obvious product design tradeoffs, that I'm curious what led to it shipping in the first place. Was it an exec who was excited about Soli pushing it through? Was there a design/engineering communication breakdown? Would be very interesting to be a fly on the wall in the retro.
Aside from that, the Pixel 3a doesn't have wireless charging, so if that also applies to the 4a it's a total deal-breaker for me. And I really enjoy the performance of the Snapdragon 855 - especially with 90Hz forced at all times and animations tweaked to run at 2x speed, it's extremely noticeable how fast this phone is.
Not saying the Pixel 4a won't be a good phone, but the 4 is definitely better for premium features imo.