I have a Le Pliage and agree with you about its advantages and disadvantages.
I have always (thought that I) preferred structured bags (like totes and satchels) and the Le Pliage, while nice, doesn't look as good unfilled as mostly filled, in my opinion. Yet it's so light! And fits so much!! And doesn't get damaged by the rain! But I want a few pockets!!! Arggggh!!! What's a woman to do?
Well, I went out and bought a crazy hobo! I hemmed and hawed and doubted my sanity.
Turns out it works better for me than I ever could have expected. I LOVE this bag. It fits my (13") laptop plus a sweater, plus a water bottle, plus a book, plus wallet, plus, plus, plus. But if I empty it of all but a phone and wallet, it collapses into itself and looks small and sleek somehow. (How? I don't know. It's a miracle). It fits under my arm and has a nice wide strap. The length of the strap, that some complained of, is actually an advantage to me -- it is not *too* long. More balanced (for me).
Plus, it has phone pocket and zippered pocket inside, which is all I really need.
I just bought a similar white bag for summer. It's not quite as large and would not work for a 15" computer but should fit mine okay. It's not as great a style for me but I got it cheap on ebay. Unfortunately, I could not get the Bryn in white -- I waited too long and they were gone.
ETA, I HATE sliding straps with a fury that surpasseth all, and my Bryn bag has never, ever slid, NEVER. This is one reason I adore it. I also adore its soft soft texture, which I literally pet.