You _want_ a forgetttable politician. I don't really agree with Theresa May's general politics, but she's a competent politician who knows what the job entails.
they are both a memes, not noteworthy for anything but making UK slightly worse than when they started (like all tories). 'I voted against brexit so here I come to implementing it' Theresa, and 'I did not last longer than lettuce' Liz.
Maggie fucked UKs middle and lower class so spectacularly that she is actually remembered.