The developers would love to spend their time coding and crafting elite and elegant systems - but management at these companies has other things that they want them to do. Endless meetings, Alignment, Training, Constant Interviews, Quarterly Project Planning, Performance review...
Each one of these distractions can blow the mental context of a developer for hours as well - so not only do they get very, very little time to actually "program" - but the time they do get, is now mostly trying to get back into "flow" , re-establish a full mental context of the project, etc... So - that 5% is likely a huge over-estimate of the amount of "productive" time a developer has, as a good chunk of that is just recovering from the bullshit that the company inflicts on them so they can go heads down and actually start doing "work" - realistically I bet if you watched your average developer at a big FAANG - they spend substantially less than 2% of their time actually heads down coding productively.
Each one of these distractions can blow the mental context of a developer for hours as well - so not only do they get very, very little time to actually "program" - but the time they do get, is now mostly trying to get back into "flow" , re-establish a full mental context of the project, etc... So - that 5% is likely a huge over-estimate of the amount of "productive" time a developer has, as a good chunk of that is just recovering from the bullshit that the company inflicts on them so they can go heads down and actually start doing "work" - realistically I bet if you watched your average developer at a big FAANG - they spend substantially less than 2% of their time actually heads down coding productively.