I have a w541 I librebooted. Which afaik might be the newest one that you can do it with.
The process was fairly involved particularly because they hide the bios chips underneath the motherboard on this model so the whole thing needs to be removed. And it has 2 bios chips so you need to split the payload then read each chip. And then flash each chip with half of the payload. Depending on what yours is the process may or may not be different.
Whether it's worth it or not. Depends on you. If you care about some of the things mentioned above during the Russia sperging. Then yes. If you don't care then maybe not. To me I liked the idea of having not having the Intel me. So I did it.
One drawback. Depends on what you flash it with. The seabios payloads. Are bios, rather than UEFI. So you will want to have your driver's set up do use a bios boot. Instead of UEFI. You can also use their coreboot. Which is basically grub embedded in your bios. For that it doesn't matter if you use uefi or bios boot afaik.
I can't remember if they offer tianocore. If so that's basically an open source uefi implementation. So if they have that, it could be a good option for you.
There are more little details. A lot of them. But I don't want to spend all day writing this.
@Betonhaus cosmic is still an alpha. If you want a smooth experience I wouldn't use it yet.