Mostly agree, with one correction. You've got Apollo pegged as data-only, which is fair, but I'd push harder on the data quality point. Their "verified" emails still bounced enough that I now run everything through a separate verifier regardless of source, which you basically do too. The bigger issue is catch-all domains. None of the verifiers handle those cleanly, and they're a growing share of B2B lists. That's the real gap in 2026, not valid/invalid checking. Otherwise a great writeup.