I don’t really know what my AIBU is here but it seems like the recommended amount is fairly unachievable for a lot of people - in fact I’m pretty sure a large proportion of adults do approximately zero intense exercise.
I disagree and by the way it isn't a competition you know. You do you. Why are you so focused on the fact you clearly think most people are lazy?
The NHS guidance is universal so has to cater for the fact there are 67 million people in the UK, all with varying needs, health challenges, lifestyles, family commitments and personal motivation.
There will be many who do a lot more than the NHS guidance and there'll be others who struggle to put one foot in from of the other and need some advice on a structured weekly exercise regime,
fwiw I think the NHS guidance is excellent, very balanced and achievable:
do at least 150 minutes of moderate intensity activity a week or 75 minutes of vigorous intensity activity a week
75 mins a week is not an excessive amount of vigorous exercise over a 7 day period - about 2 spin classes, 2 running sessions or 2 HIT classes. Or a couple of Park Runs. Or a couple of swims (front crawl or fast breaststroke)
it's an achievable goal for a person who doesn't exercise at all, to build up to that recommended amount.