Sadly code minimums for newer builds haven’t really changed drastically in decades. It’s all just 2x6 with batt and poly, fundamentals the same as it has been since the 1970s. My 2019 build just had the shower lines freeze because they’re against an exterior wall (-30 cold snap, but still).
You’re probably right though that a heat pump is a better investment. Redoing the entire building envelope is a big ask if it’s not deteriorating and needing work anyway.
I’m an architect. It’s nice having the project I’m actively working on always active on one screen, with design sketches, marked up revisions, email with comments from client, renderer etc. active on the other. Sure it only saves a second not having to tab back and forth, but if you’re doing it non stop all day it makes a big difference. Also just less effort.