Hardware controls are meaningless if an attacker gets you to click on a dodgy link in a phishing email or you fall for a social engineering scam when "Microsoft" calls you because your computer has a virus.

Umm, no. Just...yeah, no.

The main problem with this theory is that Microsoft is absolutely abysmal at user end security, and they always have been. Frankly, they do not understand the issue.

But, more to the point, the whole TPM/secure boot stuff is a compromise; originally (I think this was about the time of Vista), they partnered with OEMs to have them include a DRM chip that made it literally impossible to install any non-windows OS on your laptop. They've managed to still get an implementation of TPM that makes switching your OS too confusing/difficult for the average user.

Anyway, bottom line is they only care about money, and they neither care or even understand the security needs of the end user.

Because Windows not only encrypts the system disk (C:) but also all connected hard drives

And they're gonna just enable it without asking if i want all my hard drives encrypted first?

Nah dude. TPMs have always been about implementing DRMs. These companies hate that they can't control our PCs, they want to be sure we can only run their approved apps. Like it works in iOS and (to a lesser degree for now) in Android. And even there they are pushing hard for even more restrictive DRM.

For example, some years ago I worked with a SaaS that implemented and sold some security products. One of our customers was a big retailer (for specialized products, not going into more details to avoid doxxing) that was having a problem with scalpers buying all their inventory as soon as they released it. So they were trying to put a show for regulators about stopping scalpers because their customers were complaining. We suggested that the only real solution was to have some real life verification of purchases. But in the end they went with the awful attestation APIs offered by Apple and Google to "fix" this. And in case you are not familiar, these APIs are just TPM based DRMs. So now, if you have a rooted/jailbroken phone you can't even buy with this retailer anymore.

Note that this company wasn't trying to fuck customers directly, they were just lazy and incentivised to not really fix the problem (a sale is a sale, even if to a scalper). But even then the end result is that their customers got their digital freedom rights restricted. It's just a terrible technology IMO, the incentives from companies are all terrible. And that's before we start considering the real intentions of awful companies like Microsoft, Apple and Google. IMO they are actually pushing for techno feudalism, but that's my conspiracy theory hahaha.

So no, I doubt they were thinking about security with this recall bullshit. As other people have explained in their comments it doesn't really protect much in practice. Plus this whole AI push has just been a stupid scramble from these companies to grab a big piece of the stupid AI pie from other companies hahaha, there is no long term plan here, don't lie to yourself and us.