Would you recommend guys installing this on the new Raspberry Pi4? (4gb model)?
installing this on the new Raspberry Pi4?
You mean installing Webmin, sure, it is based on Unix, and Raspberry 4GB can efficiently run a Unix system. Though i have not see this in practice.
Sure, any Linux based system is lightweight and can be easily run on a Raspberry pi.
It shouldn't be a problem installing it on Raspberry. Since it is Linux, it will be compatible.
I have never tried this out, but i don't see it being a problem at all. Raspberry can run such very well.