Many people find selecting a candidate for political office with 20-30% support to be deeply suboptimal. You're flirting with your government being perceived as illegitimate by regular citizens. At the national level these are incredibly powerful offices- imagine a divisive President ruling the US having won under 30% of votes cast. This is how civil wars start. Yes there are a few countries whose systems work out that way (the UK at times), and it's been criticized for decades.

>what's unnatural is the idea that 50+% of a group

This is literally how a runoff works- a pragmatic system that's been used for decades by 50+ countries globally. It also enhances democratic legitimacy, as the majority of people feel invested in having voted for the eventual winner.

(To be fair, I will say that using AV to select the top two candidates who then go to a runoff is pretty interesting)