Maybe... unless you want to be able to switch carriers. At which point, it too becomes a throw-away brick, when all it should have needed (if they were more PC-like) was a swap of the radio portion that handles what bands it connects to.
But no... of all things, Google itself had to shut down Project Ara, which was about the best chance we'd ever have toward a fully modular, built-by-you kind of phone. For all the flak that iPhones get, one thing I can't take away from them, is that at least as of the 6S, not only is it compatible with every US carrier, but has more LTE bands supported than anything out there at any price point.
Meanwhile, LG already has radios that it has access to with support for all the US bands. they put them in happily with the Nexus 5X. But won't share them with any other model. That radio in a V10/20, or G4/G5 would have been a god-tier phone. But no, everyone wants to clone the iphone's looks, rather than be better than.