To be fair, you trust Microsoft to be your OS. Installing another browser means that there are now two parties that could be malicious or hacked (distribute a compromised update) rather than one.
FWIW, I run Firefox on Debian Linux and an open source browser on Android as well (so no Safari hijacking going on either), but I can see valid logic in their statement ...even if they might not themselves have considered whether this is true before using it as marketing
To be fair, you trust Microsoft to be your OS. Installing another browser means that there are now two parties that could be malicious or hacked (distribute a compromised update) rather than one.
FWIW, I run Firefox on Debian Linux and an open source browser on Android as well (so no Safari hijacking going on either), but I can see valid logic in their statement ...even if they might not themselves have considered whether this is true before using it as marketing