That 2010 coalition was pretty disastrous, but most especially because by almost wiping out the LIb Dems in the subsequent election it led us into Brexit, and hence Boris. And that was a consequence of FPTP.

It has has enabled the Tory party to stay in power for pretty well the whole of the last century. There is every reason to expect that this will still be the case for the next century.. This is in spite of the fact that there has pretty well always been a left of century majority popular vote.
(The only exception to that was in 1931 and 35).