This is not correct, but there are many people making this claim. Yuzu is arguably the most popular emulator, and only around 20% of games work well out of the box (https://yuzu-emu.org/game/). A further 30% require tweaks, or operate sub-optimally. The remaining 50% either don't run at all or offer a terrible experience. The thing to remember is that even if you pick one of the games in the "perfect" category, it's still not perfect. For example, you often have to content with hours and hours of "shader" loading. This means choppy and and strange graphical glitches. Further, drivers for various systems are not perfect, and sometimes certain features utilising, for example, the gyroscope, don't work correctly.

There is a VERY vocal minority of Linux gamers who have VERY rose coloured glasses on for anything Linux. I expect some of them to respond to this comment with some variation of "well I have never had any problems with Yuzu. It's the most amazing thing I've ever used in my whole life!!!"