[xve]

Unfortunately, almost any phrase can become a thought terminating cliche, the phases in the Wikipedia page are just the easiest ones to spot. Counterintuitivly, I've heard people say things like "let's just think about this", "how about we take a step back", "let's pause and come back to this", etc. as a thought terminating cliches. This leads me to conclude there's something more going on here. On the surface these types of statements imply reflection, carefull consideration or a call for thoughtfulness but somehow the way they get used does the opposite. Maybe it's the tone, or maybe it's the intent of the speaker. Maybe it's when someone just wants to end the conversation they use whatever phrase is necessary to just end it, while preserving some degree of plausible deniability (not wanting to reveal that they simply want to end the conversation).

The opposite might be true as well, maybe the example you used can be a way to start a conversation and not end one.