Considering the state of security in modern computing devices and the various OS's that power them, security updates mean less and less to me over time. Nothing is secure and likely won't ever be. I'd argue we're collectively less secure in 2021 than in 1995 despite massive advances in all other areas of the field.
Adding features probably increases the number of bugs, but security updates generally reduce the number of (exploitable) bugs. So I think that not taking security updates is throwing the baby away with the bathwater; stay on Win10 as long as you like, but apply the security updates.
You can actually block feature updates and still allow security updates on Windows 10 through GPO (Win + R, gpedit.msc). Pretty cool and somewhat little-known feature.
