My dad spent most of his working life on "preaching" road safety for the local health service, reviewing all the data in the world (more or less) to tell people what works and what doesn't.
Unfortunately, one thing he learned is that every measure of forceful compliance is consistently more successful in preventing accidents and deaths. Seatbelts save lives, but they had to be made compulsory by law to drill the concept into people; and even with that, it takes un-inescapable annoyances like this alarm to get into compliance that last 5-10% of stubborn idiots who just won't do the right thing. Full-face helmets save lives, but so many people insist in using pointless "bowls" or even nothing at all. Respecting speed limits save lives, but it takes speed cameras to actually persuade people to do that. Etc etc.
The technical implementations can always improve, of course. And tbh, it takes nothing to fix the issue reported: just fasten the belt "empty" when you have the dog (and accept the poor thing will not survive an impact...). The industry is what it is because People Are Bad At Risk-Assessment, and that's that.