What Counter-Arguments can be said about the fact that the UK has a Multi Party System (EX)

-FPTP will never allow a Permanent Multi-Party System -2017 GE saw the Highest Vote Share between the 2 Major Parties since 1970, at 82.3% 2019 saw it fall to 75.8% -Lib Dems Redemption Arc in 2019 was fairly Abysmal