That's the problem, right there.

Companies either don't allow for IT oversight of accounts or charge more for accounts that can be overseen. Companies don't want to pay the extra, if that's even an option on the platform, so some passwords end up being fairly common knowledge among the IT staff.

As for your computer login? No thanks. Microsoft has been built pretty much from the ground up to be administratable. I can get into your files, check what you're running, extract data, modify your settings, adjust just about anything I want if I know what I'm doing. All without you realizing that I've done anything.

Companies like Autodesk really don't have that kind of oversight available for accounts that they're willing to provide to an administrator that's managing your access. I should be able to list the license that you've been given, download whatever software that license is associated to, and purchase/apply new licensing, all from a central control panel for the company under my own administrative user account for their site, whether I'm assigned any software/licensing or not. They don't. It makes my job very complicated when that's the case.

In the event you brick your computer (or lose it, or destroy it, or something.... Whether intentional or not), I sometimes need your password to go download your software and install it, then apply your license to it, so that it's ready to go when you get your system back. You might lose any customizations, but you'll at least have the tools to do the job.

On the flip side, an example of good access is with Microsoft 365. You're having a problem finding an email, I can trace the message in the control panel, get it's unique ID, set your mailbox to provide myself full access to see it, then switch mailboxes to yours, while I'm still signed in as myself, find the message you accidentally moved into the draft messages folder and move it back to your inbox. Then remove my access and the message just appears in your inbox without you doing anything. I didn't need to talk to you, I didn't need your password... Nothing. No interaction, just fixed.

There's hundreds of examples of both good and bad administrative access, and it varies dramatically depending on the software vendor. In a perfect world I would have tools like what I get from exchange online for all the software and tools you use. Fact is, most companies are just too lazy to do it, instead of paying the developers to do things well, they'd rather give the money to their shareholders and let us IT folks suffer. They don't give a shit about us.