It's not though, is it?
Thatcherite reforms, neutering the unions and opening up markets was a clear ideological choice (whether you support it or not). Callaghan wouldn't have done it.
Blair massively growing public sector investment, ditto. Major wouldn't have done it.
Cameron/Osborne austerity, ditto. Brown wouldn't have done it.
The Brexit referendum, was really about Tory party management. I don't think Corbyn would have done it.
The Covid response was very distinctively Johnsonian (instinctive liberalism, distrust of technocracy, chaotic style).
The Tories have pretty much disintegrated since, but May was a very particular personality, and Truss even more so (which other leader in either party would have done her economic policies?), and Sunak.
Starmer and Corbyn quite different.
Alternative histories where we got David not Ed Miliband plausibly would have been extremely different (no Brexit?).
Do you think the above analysis is wrong, or that Thatcherism, Brexit, public sector investment (or not), etc have basically had no significant effect on life?