Thank god. Every change causes hundreds of millions if not billions of dollars in damages.
Case in point-- my pool cleaning pump that was supposed to run for This is in spite of prior years effort to fix this specific issue.
This same kind of dysfunction is repeated all across the country from homes to industry. Thousands of tiny cuts, significant increases in automotive accidents, and a measurable increase in all-cause mortality even excluding the auto accidents.
After this is activated the next damage producing time meddling to fix is leap seconds: Without leapseconds it'll take 4000 years for solar time to drift an hour -- and if people still exist care about solar time agreement with some arbitrary clock numbers at that point they can simply adjust all the timezone definitions by an hour at that point and be good again for thousands of additional years.
Like the DST changes leapseconds cause an enormous amount of disruption and failure and as more of our electronic systems depend on precise synchronization the amount of disruption is only increasing.
While the displacement of leapseconds is shorter, they are more rare than DST changes so systems are less likely to be tested against against them. In particular, we haven't had a negative leapsecond before but they're possible and one will almost certainly happen in the not-distant future if we continue to apply them.
Unlike DST whos times are perfectly predictable except for politics, leapseconds also have to be signaled shortly before they apply. This creates a massive amount of additional complexity and avenues for error and security vulnerabilities. With the development of solid state atomic clocks we could reasonably expect to see affordable timing devices that never need to be set in our lifetimes, -- but they couldn't keep accurate time in a world that used leapseconds.