Given enough time, I would assume that any quality question could be typed out on a device provided that the device allows to type out symbols present in the allowed formatting syntax.
Consider this scenario:
User is tampering with his Internet connection in some way (for example, executing scripts on his/her household router) when suddenly the Internet connection is lost. Let's assume a user has no other way to access the Internet except for the user's mobile device via a mobile data plan and let's assume the user is not able to find a satisfactory result on the Internet. The user has the scripts he ran on his computer accessible to him, perhaps even an ambiguous error message or stack trace.
The user ponders on the situation: "Okay, I'll go onto Stack Overflow and ask about my problem, sure it'll perhaps take me 10-20 minutes to type everything out properly, but at the moment this is my only way to hope to resolve this."
The user then proceeds to access Stack Overflow, but he is disheartened by the fact that he is unable to ask the question because this functionality is denied to him.
Despair ensues.
TLDR:
Quality questions arise from enough motivation to resolve an ongoing issue, not from the limitations of a platform.
