My stem has crept up to seat height with age on my drop bar road bikes. I'm using Nitto Technomic quill stems. Another reason is that it's harder to keep my head up with eyes on the road on descents while tucking in and ducking down to the stem which I do a lot of.
Not as aerodynamic but I probably make up for it some by spending about half or more of my time on the drops which I probably wouldn't do as much anymore with a lower stem.