[bastawhiz]

PyPy has definitely had the most success of all other implementations, but it still has a painful warmup period for many workloads. I can't imagine it's an effective option for anyone to install as the default Python implementation on their laptop, for instance. And for many, many years, it had almost no modern Python support (but I'm of course very glad to see it's slowly catching up).

It is encouraging for PyPy to see some influx of money in recent years. But I will continue to patiently wait for it to hit enough of a sweet spot of performance vs usability vs compatibility to see real adoption.