I agree with OP.
For context, I WFH and in my previous job I managed others who WFH too so seen both sides of the coin. My job is very much project/task-based rather than operational so that will shape my experience too.
I worked less productively in an office environment due to distractions/randomly being pulled into meetings or conversations that I wasn't really needed for/extended lunches with senior management etc. I make far more progress at home because I'm in a comfortable environment that's set up to be as undistracting as possible, and if people can't see me they generally won't bother me!
I hit my targets and I get good feedback. I'll not necessarily work a full 7.5 hours a day, but will work late when needed to to get things over the line in time. I've found that having time to 'think' provides better output for my job than trying to just fill up my time doing tasks (which often leads to just plowing ahead with your first method, when an alternative would have been better suited and more efficient).
Where team members/my reports are underperforming, management has been able to have conversations with them to diagnose why that is - is it (a) competency, (b) motivation, (c) confidence, (d) just shit work ethic? I've only come across one case where it was shit work ethic - all other cases were a case of the person needing additional support, and they ended up becoming valuable to the team following the right conversations + progression plan.
You can't measure someone's contribution to an organisation by meetings attended, keyboard strokes, or mouse movements - the most inefficient people are often great at all three. You'll find you get the most value from those who take some space to sit back and think about a problem, formulate a plan for how to implement it, and then go ahead and get it done.
E.g. compare the 'productivity' of someone who spends 1 hour manually copy-pasting values from one excel sheet to another vs someone who gets the same end product through a 20-second vlookup. Or someone who attends a pointless meeting for an hour where they contribute nothing vs the person who declines the meeting and comes up with an idea for an additional revenue stream whilst doing the laundry. But often the person who does the 1 hour copy-paste will often resent the vlookup person for not doing the 59.5 minutes of pointless work and the meeting attender will resent the laundry person for 'dossing'.
There are, of course, jobs that you need to be constantly present for - e.g. if you work remotely in a call centre/customer services etc. In those cases, you really can't be excused for stacking the dishwasher when your job role is literally dependent on your availability.