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FTP with SSL/TLS in Dolphin

Hi, is there a reason why FTP with SSL/TSL (ftps://) has not been implemented 
in Dolphin? 

There are some wishlist bug reports about, like the following from from 2003:

There was a kio-ftps, but it didn't work very well. Furthermore, it hasn't 
been ported to Plasma / KF 5.

I wonder whether this protocol is somehow discouraged, or it's just a missing