This is an interesting point. But the spikes in revenue when tax policy changes indicates sensitivity. Further, that there are other countries with wildly different tax revenues as of GDP implies that there is lot of scope for change. https://en.wikipedia.org/wiki/List_of_sovereign_states_by_ta...

But in the US itself, if it is true that high tax regimes(for both income and corporate tax) did not prevent dynamism in the economy (because of what Hauser observed or otherwise), that would be an interesting to note. One analysis I read, in Jacobin - a pro-socialist magazine, was that the critical difference was that in the US, companies were allowed to fail, whereas in the USSR failures continued due to political reasons and absorbed a lot of resources.