There is a lot of fear and misinformation circulated about LiFePO4 batteries in general and direct charging from the alternator in particular.

The discussions get a little weird.

Nancy Reagan: People shouldn't do illegal drugs because they are harmful.
Me: Yes, illegal drugs kill about 106,000 Americans a year. And legal alcohol kills about 178,000 and cigarette smoking about 480,000. People should make informed decisions about what they put in their body.

Nancy Reagan: But illegal drugs kill people!
Me: yes, lots of things kill people. Traffic accidents kill about 36,000 Americans each year. Pool drownings about 389.

Nancy Reagan: OMG, also don't get near pools!
Me: or maybe learn to swim?

This claim that a thing is fundamentally different is called special pleading.