One the one hand yes, but on the other hand unfortunately it also complicates backups and makes them somewhat non-portable. While APK backups aren't officially

One the one hand yes, but on the other hand unfortunately it also complicates backups and makes them somewhat non-portable. While APK backups aren't officially supported and therefore might not factor into the decision making, curiously enough Google itself only recently added a feature to the Play Store which apparently allows direct sharing of APKs between nearby devices. Split APKs however mean that you can only sensibly share apps with devices having the same screen density, language, etc. as your own device, somewhat devaluating that feature again.