It would be helpful for the current generation of smaller electic vehicles that are fine for daily use but would need to stop every 100 miles on a longer trip in winter.

Just got home from visiting family a couple of hours away in the highlands here. Battery is now at 40%, it'll take almost 2 days of charging at home to get it back to 100%. Hopefully I don't have another significant open highway drive to make in the next day or so.

Also our electricity rates fluctuate based on the underlying wholesale rate. It's going to be clear and sunny tomorrow at midday. Sure would be nice to be able to set my car to charge at midday when the price is single digits cents per kw, or maybe even negative. Instead I'll just have to drip it in with the higher rates at midnight-6am and know tomorrows cheap rates will average out to a much lower cost.

TLDR: definitely useful even for people who charge at home.

Man, people have wildly different lifestyles than what you presume, also some of us live in colder climates where official battery numbers become a joke. Those numbers would be unacceptable for me and my family for example, annoying and disrupting every single weekend. Suffice to say we own 2 ICE cars and no electric car is coming anytime soon, the overall costs and inconvenience are simply too high.