These days, I see everyone arguing again about L2: who has higher TPS, who pays lower fees, who offers better subsidies... It's quite lively, but what I care about more are the three old issues: who actually holds custody of the assets when you put them in, whether you can exit smoothly if something goes wrong, and whether there are traps like "looks very smooth but actually gets stuck at the bridge." Whether it's parallel processing or sharding, honestly, it's all about scalability narratives, but don't be fooled by the data charts. First, understand the exit paths, latency/challenge periods, and permission switches, then talk about the user experience. As long as nodes don't go offline, I can take a nap; but assets going offline is what really matters.