My suggestion is to add a suitable command automatically or a different one if specified in the options, so
\newfontfamily{\nfe}{Nicest Font Ever}
would define \textnfe with \DeclareTextFontCommand{\textnfe}{\nfe} whereas
\newfontfamily{\nfe}{Nicest Font Ever}[textcommand=\iwantnfe]
would do \DeclareTextFontCommand{\iwantnfe}{\nfe} instead.
If the automatic addition is not felt appropriate (I can think to various arguments against it), the option would avoid users looking for not really famous commands such as \DeclareTextFontCommand and the interface would be neater.
Description
This is a feature request about defining text commands after
\newfontfamilyand\newfontface.Check/indicate
Further details
It happens quite frequently that after
\newfontfamilyand\newfontface, users need a text command for choosing the appropriate font, saySee https://tex.stackexchange.com/search?q=declaretextfontcommand+%2Bfontspec for hits.
My suggestion is to add a suitable command automatically or a different one if specified in the options, so
would define
\textnfewith\DeclareTextFontCommand{\textnfe}{\nfe}whereaswould do
\DeclareTextFontCommand{\iwantnfe}{\nfe}instead.If the automatic addition is not felt appropriate (I can think to various arguments against it), the option would avoid users looking for not really famous commands such as
\DeclareTextFontCommandand the interface would be neater.