"I can use Linux because if I get stuck I can just switch to Windows and still access my data" is a comfort that probably keeps people from even trying Linux (or other OSes)?
Why else would MS not support BTRFS/ZFS/Ext or whatever?
{I'm not saying that I think this works.}
You seriously can’t think of another reason? File systems are complex. Maintenance is a huge burden. Getting them wrong is a liability. Reason enough to only support the bare minimum. And then, 99% of their users don’t care about any of those. NTFS is good enough