"Perhaps someone who has such narrow and specialized communication needs that they need to browse the web via email isn't in the best position to be dictating what communication methods the world at large should use".
Boiled down futher:
"What's good (and bad) for one person with specific needs isn't the same for everyone else".
Maybe:
"Perhaps someone who has such narrow and specialized communication needs that they need to browse the web via email isn't in the best position to be dictating what communication methods the world at large should use".
Boiled down futher:
"What's good (and bad) for one person with specific needs isn't the same for everyone else".