[tripzilch]

Not so high when it really is the equivalent of an app-developer unaware that an iOS app won't run on Android.

[cpmsmith]

I'd much sooner compare it to an app developer not thinking backward OS compatibility is necessary—far more pervasive

[edit: coherence]

[richforrester]

Since I started this, I'd make the analogy that "not realising what level of contrast can pose problems" is about as common as "not commenting your code properly".