No but maybe for you it’s fine to assume that and have no interest.
For me it’s the same as why I want to run linux as the OS. There is no single specific thing that I want that linux provides, it’s the fact that it provides anything I might ever possibly want (or at least allows for the possibility and doesn’t prevent anything), whatever that might be, whenever that might be, without having to predict or itemize it. If tomorrow I discover that I have a problem with something, or just want something, I know I can do something about it.
For instance, currently almost all modern machines have a new problem with suspend, driven by Microsoft ultimately. Well, if my bios was open like my OS is, we would only have the “modern standby” problem for about 11 minutes after the first developer or even merely capable user it annoyed. Instead we have a well known industry-wide problem affecting basically all machines, persisting for more than a year now, and we all just have to just sit here and live with it instead of fixing it. It’s ridiculous.
In the past, I had an expensive Vaio laptop that had a cpu that had VT-x, meaning that I should have been able to use hardware enabled virtualization on it, but in fact could not, and only because the bios disabled it, not because the hardware was missing. Someone actually managed to binary edit that bios and enable the feature and it worked, so, that is the ultuimate proof that there wasn’t some mystery hardware support still missing. Someone hacked the bios and it worked, so there was nothing about the rest of the mothernboard design that stood in the way.
Similarly, almost every machine I’ve ever used, servers and desktops too not just laptops, had buggy or incomplete acpi, which screws up all kinds of things like cotrolling power/backlight/radios/camera/mic, reading sensors, etc. All fixable if the bios were accessable like the OS is. Instead what we have is the “noacpi” kernel boot option to just disable and ignore acpi entirely when it’s too buggy.
No, it’s not about 2 seconds of boot time.