Uhm there is a prescision boot overdrive for Zen 2 chips, but you should definitely overclock it to get better performance. To put this into perspective, precision boost might get you like 5 - 10% overclock, but manually, you can definitely get at least 15% if not more given decent cooling. If you're comfortable with overclocking, you should definitely do it.
No, manual overclocking is crap on Ryzen 3000.
A)The trade-off is worse ascending the product stack.
Ok, so Ryzen 3600 - 4.4ghz OC... let's ignore FIT Voltage and whatnot, for now, and assume it's actually stable there - out of it's advertised 4.2ghz single thread, and however much it was boosting to across all threads before - 4.0ghz, give or take?
So, 200mhz gain single, 400mhz multi.
Now take the opposite end of the stack, the 3950X. I remember this one from a thread just last month: a 4.3ghz OC.
That user just threw away 400mhz, because the 3950X has a single thread boost of 4.7ghz... and they gained 100 - MAYBE 200mhz all thread?
What use is that all thread OC if many apps still depend on single thread performance?
B)It's an inferior method to performance tweaking these cpus compared to:
-slapping an 'overkill cooler' on it, because the cpu already boosts itself if the thermal headroom is available
-memory up to 3600/3733mhz, FCLK to half of the frequency, and then tightening the timings via Ryzen Dram Calculator
No need to bother with FIT Voltage or whatever, no issue with single thread performance loss, and all thread OC doesn't really offer anything over it.
Lower thermals, you say? Nah, that's just herd/hive mentality creating an issue out of nothing.
C)Overclocking Ryzen 3000 without finding the FIT Voltage, and then prematurely killing their cpu in a matter of a few months.
What actually kills them isn't voltage, but is related to it: the amount of current. Normally, the cpu takes care of that itself. When one manually OCs, it doesn't do that anymore, passing the task to the user... and that's where the FIT Voltage comes in.
If folks still want to manually OC Ryzen 3000 despite the above... well, that is their choice, but to suggest someone do it to get better performance? That's very situational.