Well "almost always" is a step in the right direction, though I'd say is still a tad too strong. Probably favorable working conditions are reliably improved by

Well "almost always" is a step in the right direction, though I'd say is still a tad too strong. Probably favorable working conditions are reliably improved by unions, but there are also probably reliably less jobs to go around in union situations. And of course the specifics of the job also probably matter quite a good deal. I would be content with something like "Amazon warehouse workers would likely have reduced hours and improved medical benefits with a union."