Multiple aspects. PoS offers much, much stronger security than PoW while being about 4000x cheaper to run and sustainably decentralized. Sharding (along with rollups) allows for a truly global scale platform - over 100k TPS, potentially 1M, while still running on normal computers in people's homes. PoS is a requirement for sharding, as dividing security under PoW would make each shard too easy to attack.
Last but not least, full eth2 turns eth into a positive yield asset, a share in ethereum (real income depends on fees paid by users - ethereum already dominates).
To not overhype, the current launch is really an incentivized testnet only for PoS itself - real ethereum still runs on PoW as it was. It's important because it shows that after long delays eth2 is finally starting to happen, and because consensus itself is like a car that can drive without transporting anything or anyone - not very useful at the moment, but changes required to make it useful are relatively small compared to building the car from the ground up.
Last but not least, full eth2 turns eth into a positive yield asset, a share in ethereum (real income depends on fees paid by users - ethereum already dominates).
https://cryptofees.info/
To not overhype, the current launch is really an incentivized testnet only for PoS itself - real ethereum still runs on PoW as it was. It's important because it shows that after long delays eth2 is finally starting to happen, and because consensus itself is like a car that can drive without transporting anything or anyone - not very useful at the moment, but changes required to make it useful are relatively small compared to building the car from the ground up.