XPS was never their professional product line. Latitudes were their workplace fleet devices that mostly went head to head with ThinkPads.

This is probably good evidence that they needed to simplify their branding. Having their halo consumer product compete for market mindshare against their professional products is counterproductive. Especially when everyone wants to cross shop against MacBooks.

In contrast, ThinkPad's X1 shares almost nothing with the rest of the Thinkpad's professional line, but it sits there adding prestige to the brand.