Unfortunately two very big things happened afterwards:

1. Covid, which caused a dramatic shift in the EU focus and required the Commission to permanently take on lots of extra responsibilities (debt, shared procurement of medical goods and vaccines, way more international recognition/influence, etc)

2. Brexit: Ireland has to follow whatever Northern Ireland does. Northern Ireland's Unionists will never tolerate being in a different timezone than London, and Farage and his cronies in the UK will never tolerate having to swallow down an EU directive for ideological reasons. BoJo was already saying back in '19 that the UK was going to keep daylight savings only to spite the EU. This means that Ireland will almost 100% veto any changes to DST unless London is on board with them.

There's also an underlying internal divergence about what abolishing DST should look like. While nobody in Europe likes daylight savings (the material act of switching), Southern and Northern Europe have a very different opinion about which timezone to keep. Right now basically 70% of the EU is in CET/CEST, so trade and business are frictionless - from the tip of Sweden down to Malta, from Galicia to the Suwalki Gap - all year round.

The issue now is that Northern Europeans generally don't give a fuck about more daylight in the summer - they already have a humongous amount of daylight during the night. What they'd like to do is to keep "natural" time all year around, because summer time would cause the sun to rise extremely late in winter. They'd like CET to become the new central European standard.

On the contrary, in Southern Europe people don't really care that much about sun rising at 7 or 8 in winter but really love the extra hour of sun on summer evenings. This means keeping CEST all year round.

Given that having a timezone between Southern Germany and Austria/Northern Italy or between the Rhineland and France is objectively terrible for the EU economy, nobody is going to propose this ever again unfortunately. I think we're stuck with DST forever unless someone caves - most likely the Nordics. Having basically all of Europe on a single timezone is just too convenient, that's why nobody went back to their previous timezones after Hitler and Franco fucked them up in the '40s and why China is still on Beijing time