You can see why people say bringing a change should require a bigger majority; there’s an assumption that not voting means you’re happy with the status quo, so it’s got some logic. The problem is, it makes it damn near impossible to do anything. In the end, decision making has to be done by the people who’ll make a decision. Not voting is not a vote for no change, it’s a vote for no opinion.
Naturally people want to pick and choose, things they want to do should be easy to achieve and things they don’t want should be hard. So Tories are happy to rule the country as a majority with 36.1% of votes, but are trying to use this as a mandate to ban strikes unless you get at least a 50% turnout (meaning that the minimum mandate to hold a strike for 1 day is 25.01% of the entire electorate, higher than the 24.5 share of their electorate that entitles them to run a country for 5 years). All part of the same thing.
For this one, 48/52 would be unfinished business, according to Nigel Farage 😉 There’s a reason you need to make these calls before the vote.