What are the advantages and disadvantages of using a database management system on traditional file management systems?

I was before some years Oracle DBA (OCA). Well from my knowledge

• You can not use EMC on another storage DB duplication
• You do not have the speed of SSD
• You must have in different FS the data files and the index files
• or the very Big data files in separate disks
• Traditional FS is very much tasted so are secure, and more simple
• Maybe you can not find new disks in case of disk failure
• and more