Most people don't use Windows through choice. I wonder how many Windows 11 users like it, or have even considered there might be an alternative?
Microsoft simply don't care about Windows any more. It's only around 10% of their revenue and will shrink in the future, as they invest more in data centres and AI. They don't have the same reward for investing in it as they used to. Windows has a monopoly over the desktop platform, so people aren't going to switch anytime soon. Microsoft are just going to keep running Windows into the ground by pumping it full of adware, data collection and AI in a bid to boost profits from their other sectors.
At first glance, this seems easy to agree with. I believe that this generalization was once absolutely true. But, I don't think it survives today as it may have in in the past.
At the companies I have worked for over the past 15 years, since macOS became an option, people have had a choice at work. That choice lands with Windows about the same amount of time as you see it depicted in the consumer market. Some even have chosen not to use Windows or macOS and instead use their phones or tablets. Those options and more are available. Over the last 6 years, I've seen virtual desktops as an option, so you can run whatever you like and use the corporate computer as a remote VM. In the past 10 years, I've worked at companies that have 10k users, 30 users, and now 5k users. I also visit and talk to companies across the size spectrum.
Linux isn't an option because it isn't fleet manageable. Companies spend a lot of money trying to secure it as a server, and they are not going to try to do it on a desktop because it's not manageable.
I strongly doubt that. It actually is the business model of Redhat: supply secure and manageable Linux for both server and workstation. But it ain't free.
I am not sure what part you doubt, as it looks like you provided an example of my point. In the end, the manageability of a desktop platform comes down to cost. If committed, it could be done but as you said, "it ain't free".
I don't do MDM for a living (primary job), but I am very aware of it because it is directly in my domain of work: enterprise cybersecurity. I have previously deployed the two most popular ones, JAMF and MS Intune. These two MDM platforms and VMWare One dominate the market. For a number of reasons, I see VMware heading down around the time of Broadcom's purchase of the company.
Any given computer from any major seller can be purchased by enterprises pre-enrolled in MDM for both macOS and Windows. During my last MDM project, the end result was that the OEM shipped directly to the user. Upon boot, since it's already enrolled, the user signs in. The MDM platform then downloads and installs the required corporate software needed for the user's role. To my knowledge, only macOS and Windows are supported for this process (pre-enrollment).
A company that manages fleets must spend money to create and maintain the profiles of those fleets. These aren't easy. Users do not like their computers controlled, so a lot of work is done to try to balance the corporate security policy and user "comfort".
Can an enterprise deploy Linux Desktop? YES. Let me change the term " manageable " to "feasible", maybe? There is only one company I know of that has significant use of Linux on desktops, and that's Google. It's been years since I was under an NDA with them, so it's likely changed a lot.
Edit:
I also meant to mention that the ability to use Linux or similar environments is available on both macOS (NIX native) and Windows (WSL), and remains very manageable in pre-enrollment and MDM. In particular, WSL took much of the wind out of the sails for the Linux desktop "need," and most people in enterprises that offer macOS will simply go with it if they are avoiding Windows.