This is a key point people forget. Unions did not invent the 5-day workweek or healthcare, they stole the idea from private non-union jobs. If you think unions are going to provide some unparalleled advancement in ease of living you're going to be disappointed
I mean I'm not sure if linking is necessary but Henry Ford is widely credited for inventing the 5-day work week (which he reduced from 6 days without reducing pay).
Health insurance attached to your job is more complex, as the first major instances were in Germany in the 1800's, however generally it was a result of wage controls during WWII. Private companies weren't able to compete on wages, so they started adding benefits.
Unions do not progress employee benefits, they're hostile political organizations inside companies, and once you understand that everything else makes sense. If unions attracted top talent than companies who wanted top talent would enact them; and if they improved wages then the best wages would be union jobs. In private industry, this is essentially never the case.
They can establish better base conditions so that the top performers that individually bargain would obtain better conditions - ie 4 work days rather than 5 -. It's a silly example, it might not be 4 work days, but given that we have the actual 40hrs week thanks to striking and unions the gist remains. You are actually benefitting of the advances made by unions even if you're not part of one - in addition to your performance