It's really frustrating when people say "so what, that's just life"/"it's not hard"/"it doesn't take much time" - first of all, what do any of those statements have to do with some people referring to it as 'life admin'? Secondly, presumably, if your frustration is with people complaining about their 'life admin', their experience is not easy, or taking little time. As pp have mentioned, those of us with caring responsibilities, disabilities, chronic health conditions etc. may have less capacity for those sorts of tasks, and many more of them to complete.
As an example, I have to be seen by four separate clinics at various hospitals on a quarterly basis, and EVERY single appointment requires multiple phonecalls, emails or letters to arrange because hospitals are struggling to squeeze in even the most at-risk patients, often they forget to book you in, or don't offer you an appointment within the time your consultant said you MUST be seen... I have lost count of the number of times I've had to go to Switchboards because the quoted telephone numbers on letters are incorrect or are never answered, to then be passed from person to person and end up having to speak to a Patient Liaison Team just to get your appointment scheduled.
Then there's the amount of time you spend filling out paperwork, being assessed and appealing incorrect decisions made by the, frankly incompetent, DWP.
That's before you even start on the mental energy it takes to advocate for yourself when doctors dismiss abnormal test results despite textbook symptoms of the issue the test is confirming.
Point is, if people are complaining about struggling with their 'life admin', try considering that their experience is more difficult to manage than yours, and show a little empathy (or don't bother reading it if it bothers you so much). No need to put people down for not managing as well as you do.