eBPF can drop data silently under quite a few conditions, unfortunately. And -- most frustratingly -- it's silent, so it's not even entirely clear which condition you've fallen into. This alone is a pretty significant with respect to DTrace: when/where DTrace drops data, there is always an indicator as to why. And to be clear, this isn't a difference merely of implementation (though that too, certainly), but of principle: DTrace, at root, is a debugger -- and it strives to be as transparent to the user as possible as to the truth of the underlying system.

That's not exactly correct, and is merely a consequence of the fact that you are trying to use the pid provider. The issue that you're seeing is that pid probes are created on-the-fly -- and if you don't demand that they are created in a new process, they in fact won't be. USDT probes generally don't have this issue (unless they are explicitly lazily created -- and some are). So you don't actually need/want to restart your DTrace script, you just want to force probes to be created in new processes (which will necessitate some tricks, just different ones).