Hunter Walk thinks your TAM slide is stupid. That’s one viewpoint that the seed-stage investor shared with TechCrunch that made us laugh during our recent conversation. Walk joined us for an Extra Crunch Live chat late last week that was a mix of advice and insight about what the seed-stage Homebrew partner looks for in founders and companies to invest in. In the case of founders, “attitude matters as much as aptitude sometimes,” Walk said, adding that “grit” and “resilience” are things he favors in entrepreneurs. Why do those qualities…