To maybe throw the question back - what have you done to make 3 day weekends a reality? The way the post is worded right now seems to be phrased in a way that 3-day weekends are blindingly obvious, but if you look at the history of labour rights I dont see why anyone expects it to just happen without a massive amount of organising
Productivity has risen 61% since 1979: https://www.epi.org/productivity-pay-gap/ . 40 hour work weeks have been the standard. Wages only rose 17% in that same period. The capitalists have been able to bank the other 44%. A 3-day work week (aka 40% less productivity if you assume a perfectly linear relationship between time working and productivity) would still mean a nice little gain for the capitalist compared to 19…
While some fraction has gone to the corporations/shareholders ("capitalists"), what fraction of the productivity gains has turned into cheaper consumer goods, aka (can't point at the data, just many who comment on it) the populace owns a lot more 'stuff' like electronics than they did 43 years ago, aka QOL gains resulting from productivity.
Or is it just silly of me to not assume that ~100% of gained productivity went straight into corporations'/shareholders' pockets?