Hello Lucian,

> 
>   If I am to register a gTLD domain today as a reseller, the 
> registrar sends the successful confirmation message to my 
> reseller contact email, not directly to the registrant 
> contact. Isn't this correct?
> 

That is entirely up to the registrar's business procedures, and any
processes used between a registrar and a reseller.
For a gtld domain there is no "requirement" to send a confirmation
message at all.

Note there are also systems where a registrar sends emails branded with
the resellers name.

Regards,
Bruce