100 is unacceptably hot. Nobody can live in that for long.
86f peak temperature with 35% humidity? Tolerable. Especially when the sun goes down and the temp drops but the humidity stays lower than like 55%.
But the next day of 95f peak temp followed by 76f nadir with 70% humidity overnight? People without A/C die. The homeless die.
The incentive is going to be undercutting the competition. It’s going to happen someday, might as well be you, car company.