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No. I don't think anyone cares what the internal storage uses; that's just an implementation detail. People want to connect random drives to their ChromeOS machine and have them Just Work, which is quite reasonable.

At least on my main Linux box, the VFAT driver and USB3 driver collude to corrupt everything I store as FAT, so I've been using ext3 for my flash drives.

Actually I gave up on flash drives and just use Google Drive, but that is neither here nor there.

No actually, most people stated that theirs external storages - sd cards, usb, disk are all ext4.

I don't think so, even for external devices it seems a big regression.