Uniswap v4 feels like crypto's first complete product. Uniswap v3 was already nearly there, which is one reason why while previous versions took ~1 year, v4 took 4 years. I can see additional functionality (e.g. unified liquidity) and responding to infra changes (e.g. quantum-resistant zkVMs) that will justify a v5, but the core purpose of this application now feels complete for the foreseeable future. What's remaining is now on the governance & social end. 

Aave v4 is the next candidate for a complete product. Interestingly, the applications are hitting final form years ahead of the infra they're built on, and in cases like Aave v4, being intertwined with infra itself.

(Side-note: of course, simple "products" like memecoins or USDT are "complete")

https://zora.co/coin/base:0x8ddd2706d670b62ba1f8a430bea3882b167cf4f5?referrer=0x90a9f75a7a72a99ad290881f98cb41c8297a58d7