UTC, and leap seconds, originate from (military) navies of the world, with the intent of supporting celestial navigation. It is already dubious how useful leap seconds were for that use, and much more dubious is its use as civil timescale.
Generally, it's useful for midnight to be at night, and midday during the day. UT1 is not regular, so you need some form of correction. Then the debate is about how big and how often.