button going into trigger bang
I am analyzing and learning some patches and sometimes I see people routing a button into a trigger ( argument bang ) object , iow doing exactly the same thing as the button itself .

Is there a good reason for this ?
in the picture above, no.
except maybe that you could move the t b around indepently from the button, which is not (yet) done here.
Also in the picture: a button is connected to the output of [sel]. Not useful unless you need the visual feedback.
Also: the [loadbang] on the right is connected to both button and [t b]. Not useful (except if you want 2 hits!)
Really, it could be useful as documentation helper. For instance, the "yellow cable" [t b] comes after a [button]: it looks like it's not useful. But if you document that this [t b] does something precise, then, it becomes useful.