The keyword here is "modern". Some people use older hardware, like DVRs with ancient firmwares.

Most people, nowadays, use cloud services instead of USB sticks, so I guess it's preferred to focus on supporting legacy devices.

The real problem may be external hard drives. Those are commonly used by media creators. Unless they know that they should format to exFAT when buying, they will learn it when it's way too late.

I may be on the later category. It was ~15 years ago, and little Jimmy (me) got his first external hard drive. However, he didn't know about formats, and that he couldn't copy 4.5GB movies to his new toy.

Back then, it was either 4GB file size limit (FAT32), or it only works on one platform (NTFS, ext2, whatever Apple was using, ...)