In this case, it seems a perfectly valid choice of words.
"irreconcilable" basically implies that there is a binary choice -- either use a TUI or aim for accessibility, but you can't have both. The responder was saying that actually it's not a binary choice -- there are degrees of accessibility, and some accessibility can be attained within a TUI.
Disagreeing with someone, using valid arguments, is not the same as squelching discourse.
"irreconcilable" basically implies that there is a binary choice -- either use a TUI or aim for accessibility, but you can't have both. The responder was saying that actually it's not a binary choice -- there are degrees of accessibility, and some accessibility can be attained within a TUI.
Disagreeing with someone, using valid arguments, is not the same as squelching discourse.