Perhaps this is a controversial take, but I believe security runs in opposition to many other quality attributes (i.e., usability, interoperability). Not to say that there aren’t designs that could exist that are optimal for security and these other quality attributes simultaneously, but security massively reduces the potential design space to the point where there is no rule that at least one of these optimal designs must exist.

Quality is an opinionated measure of a design, which involves tradeoffs based on your goals, values, etc. Valuing security very high, even at the expense of every other aspect of quality if necessary, is completely understandable. But that’s a value that isn’t universally held.

If your point is that security should at least be considered when measuring quality these days (like, it’s a top 10 ‘ility’ at least): fair enough.