I hear that kind of thing a lot, how the PWM is too low or too noisy or whatever, but in the hundreds of lights I’ve had in hand over the past few years I’ve personally never found PWM to be an issue. Not once. My son has excellent hearing and he’s heard a light whine, says it sounds like some small bugs, but I couldn’t hear it unless I held it close to my ear and quite frankly, I use a light at night so I can see to do something, never have had one in my ear giving me fits. Everyone has different perceptions of what works for them, of course, just saying that for me it’s never been an issue.
If I had one that was a problem, I’d fix it… of course. Simple enough to do especially when it’s known the driver is a standard 17mm diameter.
For example, as nice as the M4 is in build it kind of bugged me that it was 2x AA in the power supply. So I built a Zener modified FET driver and put an XHP-50.2 in it. Now it uses 2 14500 cells and makes 3000 lumens, it’s really a nice light! Richard sells these drivers, simple enough to make the swap if one simply wants to. Don’t solder? Neither did I a few years ago. Even an ornery old dog like me can learn new tricks, and here I am with what… 500 or so modded lights behind me? Simple enough…