I'm pro proportional representation but I do think the argument that PR obfuscates democracy does have some merit. After all in systems where all governments are coalition governments, party manifestos have no direct relationship to governance polices with those deals instead being worked out in smoke-filled rooms. I just think that flaw is superior to the FPTP flaw where canidates who win a minority of the vote are often crowed the winner.
I don’t really see FPTP being better at deliver anything, in fact they tend to be worse at it.
It's more a defense of a two-party system that FPTP enables, that it gives the electorate a clear choice regarding what policies will be implement and who will have responsibility for the government over the uncertainty of PR.