Linux has a different design than DTrace; eBPF is more capable as a trusted tool, and less capable for untrusted tools. It doesn't make sense to say one approach has "caught up" to the other, unless you really believe the verifier will reach a state where nobody's going find verifier bugs --- at which point eBPF will be strictly superior. Beyond that, it's a matter of taste. What seems clearly to be true is that eBPF is wildly more popular.
It's really hard to bring a host to its knees using DTrace, yet it's quite powerful for observability. In my opinion it is better to start with that then add extra power where it's needed.
I understand the argument, but it's clear which one succeeded in the market. Meanwhile: we take pretty good advantage of the extra power eBPF gives us over what DTrace would, so I'm happy to be on the golden path for the platform here. Like I said, though: this is a matter of taste.
