Especially with your "buttons and doodads" comment.
I wasn't even trying to get personal, but If you're going to hit, be prepared to take a hit.
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Never once has the weight of my OS been a concern for me, and I'm going to make the assumption that is the general case for the majority of users.
Never once have I heard the metric of LOC/pixels.
You say it's bloat. I say its necessity.
It's just keeping up with the times - beautifying and manicuring to attract eyes.
And you failed to address my comment about all the logic that FE engineers have to deal with - which is more of the meat in FE development than what happens skin deep.