@GasPanic [Belgium] - No government for 600 days. I don't think it has gotten any better since then.
But Belgium is still there. The country did not collapse or cease to exist. Life went on as usual - perhaps raising the question of what governments actually do; do they sometimes cause more damage than improvements?
"PR tends to lead to endless fighting between parties as the vie for support and power with each other."
Examples please. In my experience, coalitions result in the demands of the more extreme parties having to be watered down, and the status quo of the established parties occasionally recieving a welcome kick up the backside from the newer parties.
"FPTP actually allows governments to get on with implementing policy and to me is far better in a time of crisis when decisive action is needed. That policy is not always what I want. But I won't be crying to change the system because I believe it works and is effective."
Only if the governing party acts in good faith. The "good, decent chap" assumption that the government would always act in the best interests of the country as a whole (and the principle to which the MPs agree to when they enter Parliament) that Johnson and his cronies finally and fatally blew out of the water and that the present government, more than any other, has rendered totally meaningless. The danger with FPTP is that the "stable government" morphs into an elected dictatorship - which is what the present government has come very close to and which is why we are having this discussion. Not everyone sees FPTP as being as effective as you do - some see it as an anachronistic, flawed and damaging system that is preventing the emergence of new ideas, new thinking, and new parties more relevent to the 21st century.
"FPTP actually allows governments to get on with implementing policy"
Except they don't. Not only do governments tend not to implement their manifesto promises, but in many cases, there was never any intention of implementing them. Instead, the manifesto is quietly placed in the filing cabinet, and having gained power they get on with the "real manifesto" that nobody was ever given the chance to vote on.