Re: "Quality" is a structural attribute, not a bolt-on
"changes are much more likely to be written, tested, and put into operation quickly if the codebase is modern."
Define modern. This sounds very much like the usual rant about having to periodically update legacy S/W i.e. the stuff that's earning the business's income.
And you shouldn't need to remember what that HEX code meant because there should be documentation, preferably as an old-fashioned comment in the source, to tell you what it means.