Recently, parallel/sharding has been a hot topic again, and the community keeps talking about throughput and "horizontal scaling," sounding like it's about to take off.

But for someone like me who gets dizzy reading smart contracts, I just go check: Are cross-shard messages subject to replay or reordering boundaries?
Can the permissions of bridges/routers be controlled with just an "upgradable" statement to manage funds?
The narrative around the data availability layer is the same—developers are excited, users are confused, but in the end, users only care about two things:
Can they safely withdraw their funds after depositing?
And if something goes wrong, is there a clear exit path?
Honestly, it's fun to watch the hype, but asset security and exit strategies are the bottom line—don't be fooled by the three words "modularization."