I mean that in common vernacular, when someone says "pension", they are referring to a defined benefit pension. Otherwise, in the US, we use 401k, IRA, "retirement funds", or other words.
SIPPs are beyond my lifestyle.
For a higher rate taxpayer you put in £60 and get £100 in your pension.
You can also do salary sacrifice and reduce you income tax and NI lability
It's quite likely that some people today will end up paying higher income tax rates in retirement than today.
And you can use drawdown to manage your income from the pension and you would of course make use of income from your ISA.