Why are vanity metrics useless?

From the panel discussion with:
🟢 Daniil Shcherbakov (Co-Founder @ton_tongames)
🟢 Ricky Wong (CFO & Co-Founder @CatizenAnn)
🟢 David Ching (Strategic Investments & Partnership @ Animoca Brands)
🟢 Serge Suchkov (Co-Founder @battlesjam)
🟢 Inal Kardan (Partner @ TON Ventures)