Could not disagree more. When I look at my LR library over 15+ years of shooting, most of
my personal favorite images are in the length covered by that lens. This is why we're just in the realm of opinions here. This isn't right for you. For me, it makes a ton of sense and I preordered the first night it was available at B&H.
A few specific thoughts, though: it's funny to suggest that 24mm is substantially different than 28mm. This image (not mine, found it by searching) compares the 24mm and 28mm coverage. It's not nothing, but it's not a game changer, and it made me laugh that you say 24-70 is significantly different in capability than 28-70. In this sample image, I'd argue that the 28mm offers a better crop of this mage with less dead space. The leading line created by the pathway moves the viewer's eye really nicely through the 24mm crop, but at 28mm that leading line peters out with about 15% of the image above it. I also think the houses end up placed more pleasingly to the eye in the 24mm crop. This is, of course, personal preference.
While your critiques of the speed are broadly sound in that they are not unreasonable, in many cases f2.0 is very, very workable in a lot of lighting conditions. Is it slower than the RF 50 1.2 I have? Undoubtedly. Does having a zoom range make this a great travel/general-purpose lens? YES, and that's why I bought it. The speed is enough to enable shooting in a wide range of conditions, and while the lens is big and heavy, I'm a big guy (6'2", 215lbs) and having a high-performance f2.0 zoom is enough that I can travel with one lens. I'm on the road a lot for work and taking my camera to parties, dinners, walking around, etc and this is a great option for a lens that serves those needs with really solid performance characteristics. I have a good friend who's a pro shooter, and her 24-70 is her most used lens. A full extra stop of light is substantial for her, coupled with the high performance of the RF mount lenses.
Also, it's
hilarious that you're complaining that the fastest constant-aperture zoom lens ever released isn't fast enough. Nothing's ever good enough, eh?