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")

Why do you say uniswap is complete only now? The main role for uniswap in the dapps ecosystem is providing liquidity pools and routes, which it does for a long time now. Keeping up with the tech is just what makes uniswap competitive and modern, but it was already a product from while back