How do we agree that everyone needs more vacations? Too many voters are swayed by the talking points of the wealthy who tend to have a lot of influence in the media we consume. The counterargument can even be phrased in ways that are made to look like it supports the "little guy" rather than the oligarchs that are promoting the message, for example: "More paid vacation means small businesses will have more difficulty remaining competitive, and they are the cornerstone of the US economy. Don't limit our freedom by imposing this unamerican law"

Unions were the right way in the past because employers were typically the most powerful actors in society, with the ability to sway the actions of government. Unions represented an opposing force to their employers, reigning in that power. Today, employers are still the most powerful actors in society -- arguably even moreso than before -- and some kind of worker organising or other form of bottom-up/grassroots power is needed to counter the abuses of power by the wealthy. There are already good examples of gains being won by unions or similar organisations in tech. A good example of a modern conception of worker power in tech is the tech workers coalition:

https://techworkerscoalition.org/