Given that the last time I put together a PC computer was 2006, it'd probably take me DAYS to spec out a machine because of all the rabbit holes I'd be exploring, esp with all the advances in computer tech.
PC part picker will do the heavy lifting for you. There are also management tools that will let you install software bundles easily, no real extra time investment.
Just knowing about services like PC Part Picker and the management tools you mention requires time and expertise that people generally do not have before they build a computer, so "no real extra time investment" may only be true for someone who can amortize those upfront costs across many builds.
In my case I have built a couple PCs before, but it was so long ago that I'd have to re-learn which retailers are trustworthy, what the new connection standards are these days, etc. It's just not worth it to me to spend a dozen hours learning, specing, ordering, assembling, installing, configuring, etc to save a few hundred bucks.
You have to spec out the parts, ensuring compatibility. Manage multiple orders and deliveries. Assemble it. Install drivers/configuration specific packages.
All of these things are easier today than ten or twenty years ago - but assigning it to a random mid-level engineer and I'd set my project management gamble on half a day for the busiest, most focused engineers least likely to take the time to fuss over specs, or one day for the majority.
ofc. to get to $1000 for that they'd still have to be on $230k to $460k.