I could do. Have read several over the years, and have dealt with a fair bit of estate planning and inheritance law for reasons I am never quite sure about. However I have bugger all to my name, no next of kin (worst that will happen there is a sibling or parent bashing their knee or something taking my worthless to most but me books and tools to the charity shop/dump/bonfire in the garden), medical decisions are not very hard for anybody that would be asked, passwords can be a fun one and definitely something to consider in the modern world but I have nothing that can't be pulled back by the various people that replace me (this is by design, or at least happy accident as a result of other things), even if I was not dead then nothing left unsaid as it were...
If I ever get something to my name or have a next of kin worth speaking of, the former of which is unlikely and the latter I have handily dodged for decades now and I think I can do the final stretch, I will sort it then.
If others reading do have some kind of next of kin, specifically want to disinherit one or more of the typically assumed next of kin, or care what happens to your stuff/have enough of it to worry the laws of your country when you kick the bucket (limits can be quite low) then it does fall under fairly basic adulting* and well worth doing. There are plenty of cheap and cheerful lawyers wherever I go that do a basic setup for next to nothing, and that is assuming you can't just do it yourself (most places will at least consider a nicely signed and dated document that is clearly intended to act as such, though like any law there are going to be traps and things to consider in this such that you do better to pay the lawyer to fill in their little form).
*while those in their 60s and 70s are naturally going to be the most concerned on various fronts then car crashes, cancer and the like do happen throughout it all.