When consumers spend money to buy products, where the money goes (whether it's costs of production or shareholder profit) almost never factors into the purchase decision.
While low prices can make purchase more compelling, the lack of profits never does.
another point is build quality - the Lenovo phone comes in a metal case, not some plastic.
I don't know if it does, but I live in Europe so that is not an issue for me.
Does it run a modern version of Android?
4.2.1
Does it have a modern SoC
It has more than enough horsepowers for what I do on a smartphone. It's quad-core, as for details - I never bothered.
Is it widely available in the US? Can I get after sales support?
Again, I don't know much about US, but I would imagine that a big company like Lenovo would be present there in one form or another.
In the states, if you're obsessive about your phone being on every minute of every day (and, realistically, anyone actually that important... as opposed to thinking they are for their startup... is still forced to carry a pager), you basically have to go with Verizon. That's why I have a Verizon hotspot as a backup. Not as a backup for T-Mobile, but as a backup for Time Warner, since it goes down at least once a month for a little while and down for a full day every few months.