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I think the Raspberry Pi 4 does not get very hot because it is not very fast, and it uses a mobile CPU which are found on tablets and handheld game consoles, so it may less likely to over heat.

Pis are special systems too, they could be made to prevent most viruses.

I think Windows 11 ARM/Mobile for Raspberry Pi 4 may also not come with as many features, and the regular version of Windows Defender may not come pre-installed on Windows 11 for Pi 4 since the Pi 4 uses a smaller SD card for storage, so a lot of Windows features and programs may not fit on a smaller SD card.

it would be watered down, which could lead to the lack of serious security features

Raspberry Pi Windows 11 users probably get most of their software from the Microsoft Store which may quickly remove malware and viruses which get publish. Raspberry Pi 4 users can use online antivirus like VirusTotal.com to scan download files and website links for viruses.

Never even heard of that website, kind of sounds like a scam really.

VirusTotal was bought by Google in 2012. I think Google never advertise it much.