This is just a narrative

There is no general technical reason that you *need* an L2 unless you are limiting yourself to old tech and need it to scale immediately

Even Bitcoin L1 has potential to scale over time. It all heavily depends on rate of adoption, consumer tech advances, and protocol scalability improvements. Think of increase in bandwidth and hard drive size in only a decade and decreasing cost.

If you still don't think so, here are only two examples of L1 tech that can easily scale *today*: MimbleWimble (LitecoinMWEB, Grin, Beam) and DAGs (Nano)