E.g. if the company were going to pay $2k extra but it would be taxed $1k, they would have to pay $3k to get the equivalent "happiness" boost. The employee gets $2k / year either way.
$2k tax free -> $2k in your pocket
$3k + $1k tax -> $2k in your pocket
workplace nurseries are tax free as is any child care for lower incomes. other benefits are tax free up to a certain amount.
(If $Company is not big global retailer like IKEA, then things would probably be far simpler.)
But collectively it can work; the company may talk to the union and offer either X benefit which costs $Y or $Y applied to salaries.
In every other developed country everyone has healthcare, irrelevant of job - even people that don't have a job.
Healthcare is not tied to your job, it is a basic human right.
So this discussion makes no sense outside the US.