Apart from the fact that tax cuts reduce the extent of productivity in the public sector, they also mean that money is taken from benefit recipients and those entitled to social security. The latter's consumption is very useful for the economic cycle.
They cannot afford to save and consume all their income and maintain productivity with all their purchasing power. Tax cuts give more to the already well off who can't consume all they earn and save a lot which takes money out of the economic cycle.
Source: American economist Krugman.
About a year after the Alliance came to power in 2006, productivity also stopped increasing in Sweden.
During the red-greens' return to power, when the unemployment insurance and sickness benefits were restored or increased to a certain extent, the boom also got off to a good start again.
Ancient Greece already had access to the steam engine. But they didn't use it to save up for work, because then the "free" slaves would have nothing to do.
Even today, you can see how expensive labor with good conditions increases the productivity of a society. Sweden's factories are e.g. more automated than England's.