I disagree with proportional representation (PR).
With first first past the post (FPTP), the unequal outcomes leads to majoritarian governments. To use 2019 as an example, whilst I’m against Brexit, the electorate voted Conservative and to ‘Get Brexit Done’. The large Tory majority has broke the parliamentary paralysis and the country and get on with delivering on a divisive policy that was causing a lot of constitutional strain on the UK.
With PR, the result of this election would be a lot more closer in terms of seats. You’d have more Lab-Green-Lib Dems in Parliament, less SNP- Plaid Cymru MPs. More Brexit Party MPs, less Tory MPs.
I’m not sure what the precise make up of Parliament would be, but it would probably have made Brexit drag on even longer.
In Germany, they’ve had grand coalitions for most of this decade because neither the CDU or SDP can find a coalition partner that is palatable to them since the collapse of the FDP (their Lib Dems). That’s not good for democracy either.