I agree with what you're saying. But I think if the vehicle can detect that the handbrake is on and the car is out of gear, then a remote start should be perfectly fine to use. I know the car can detect if its in gear or not and car determine if the handbrake is one, so i don't see what the big deal is. pisses me off but oh well.
In my prior car and over the course of twenty years, twice I've unwittingly set the hand brake on the edge of the teeth, and witnessed it snap loose, minutes later while still sitting in the car. Ordinarily I'd hop out and be gone. There has also been a time or few that I've gotten back in the car and saw that the hand brake wasn't set... which it would be unusual for me to forget. Sometimes they'll seize up of they're not used at all, but despite having automatic adjusters, hand brakes generally will slow fail. In roughly 18 months of ownership, I've already noticed a reduction in tension on the hand pull. This reduction usually translates into a reduced ability to hold on hills. While a responsible owner will take appropriate action, either seek maintenance and/or not park on hills, too many of us won't - then will sue Ford because the car set off down a hill after engine vibration exposed an already compromised brake. So the problem is, hand brakes aren't really reliable and require a backup of some sort.
With my prior vehicle, they used a rather stiff wire on the underside of the transmission; to the Neutral Position Switch. So through through the natural course of engine vibration, the wire would break-off at the switch. I re-soldered it, only to have it break off again. So I left it. The way the wiring diagram read, an open circuit meant that the ECU thought it was always in gear. After a break-in, had an aftermarket alarm system with remote start capability installed. The installer was technically forbidden from installing and enabling the remote start capability; and verbally told me so. But he later tried anyway, and failed, simply because he wasn't aware that the Neutral Switch was disconnected. He told me that it apparently didn't have a Neutral Switch hehehe.
Also and with advanced mileage, the hand brake became increasingly incapable of holding the vehicle on steep hills. One day I jacked up the rear and... forgot to loosen the lug nuts first. Oh well, just pull the hand brake and problem solved. Nope. One side rolled as if it weren't engaged at all. The other held super tight. The automatic adjuster was frozen. Relatively easy fix.
With really advanced mileage my handbrake gradually became utterly useless. Upon disassembly I discovered that the last of the teeth on the automatic brake adjusters were stripped. (I had already noticed from prior brake jobs that the teeth were gradually wearing down, starting from top and progressing toward the bottom.) Those aren't available new; only as a junkyard part.
Again, while I was responsible to the point of not parking on steep grades where engine compression/friction won't be sufficient, and turning my wheels into the curb, (we have high curbs here,) others won't be. Something other than the hand brake is required which means some sort of modification to the transmission.
I also had to fix the hand brake switch, due to corrosion. A prior owner had spilled a sticky drink into that area which probably didn't help either.