We have lots of small parties but they’re all essentially one of the two big parties under a different name.
Not only is this wrong, the libdems & greens are different parties to Labour, but it's also treating a symptom of having FPTP as some immutable attribute, when the political landscape is shaped by the voting system.
Also STV is particularly well suited to restoring trust in democracy when there is a lack of trust in the establishment parties as it gives voters a direct say in their MPs rather than being controlled by the party as they are with list based PR or effectively are with FPTP.