There are different (and in my view, better) ways to interpret this chart. For example, see the interesting discussion in
https://mainlymacro.blogspot.co.uk/2017/03/why-its-your-bloody-gdp-not-ours.html
This is a good post - and I say that as someone lucky enough to have benefited hugely from both ISA and pension tax reliefs. However, it's perfectly possible to do the rational thing on these as an individual, if you can afford to, and still recognise that these tax subsidies for the well-off...