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")

Curious if you have seen or tested Ekubo. Moody, who has been spearheading the project was one of the head engineers on v3 at Uniswap.

From what I have seen it's both more feature rich, and gas efficient. (30% on average according to documentation and some testing).

The TWAMM is also a huge level up, and introducing fully onchain DCA feels like a massive win. 

I would say that it does lack a stand alone accessible app within iOS and Android store though. 

Regardless DeFi has come a long way, but I do believe that other products outside of Uniswap are rising to the challenge and doing more.