Litecoin offers no significant benefit over Bitcoin. I don't care to integrate it simply because lots of people are bidding it up. I believe that to be temporary. I'm happy that there are cryptocurrency competitors, but LiteCoin doesn't excite me.
I am not sure that argument holds any logical weight.
No, it probably doesn't. I suspect the real reason for not supporting Litecoin goes something like:
"I like Bitcoin. Litecoin is a competitor of Bitcoin. So I don't like Litecoin. So I'm not going to support it."
I often see people saying "sure, Bitcoin is limited to 21 million units ever, but there's no limit to the number of Bitcoin clones; what makes Bitcoin so special?". People dismiss this by saying that the clone won't gain traction, so we can ignore them. Having Litecoin succeed kind of spoils that argument. There can be only one!