Does Market Cap and P/E ratio even matter going forward?

I've watched Apple grow from $100B to $1T, and now it's a $4T giant. Every step of the way, people claimed it had peaked and that the law of large numbers would stop it. But they just kept growing YoY. The old rule that 'massive companies can't scale fast' feels outdated, especially when the tech boom is creating trillion dollar valuations for pre IPO companies like OpenAI and Anthropic. If you're picking individual stocks, what’s your strategy right now? Are you sticking with Mag 7 mega caps for reliable but slower growth, or shifting to small caps for that massive upside potential?