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now pic rel, as an example, is 6.5 kg.
You can easily put together a singlespeed that weighs less than 8 kg for $500.
Isn't that bike gonna be easier to carry up apartment stairs? Easy to take in a lift (can just roll it up vertically)? Easy even to store somewhere, easy to hang, easy to take the front wheel off to fit in a small car. Easy even to take on a plane, as you can get a bike box for free at any bike shop, and pretty much just put it in as 1 extra piece of luggage.
People don't seem to realize that you can easily/cheaply have a bike which is extremely light. It doesn't even mean you have to be a strong rider, your mode of riding is just walk up hills.
And the only bike which is actually practical is one you're happy to leave locked up. OP mentions folding it and taking it inside shops with him, so he's carrying round a fucking heavy bike everywhere, that doesn't make any sense to me.