Use of 32-bit versions allows me to attach external drive to any system in the building.
This seems like an unnecessary risk to me: exposing your wallet to more than one computer increases the chance of either one of them containing malware.
Do serious, show-stopping bugs, still exist in mature software? Undoubtedly.
I'm not sure if this was a rhetorical question or not, but Bitcoin Core is
not mature software. If you click Help > About, it clearly states: "This is experimental software".
This is easily forgotten since it's been around for 9 years. In general, as long as any software has version number 0.x, it should be considered experimental software. Once it's mature, it should be version 1.y.