Please allow Line Weight to be set in all Arrowhead types.
The "Heavy end tick mark" Arrowhead used in Text can be set to have its own Line Weight.
Text with other Arrowhead types currently use the same Line Weight for leader lines and Arrowheads.
In "Manage | Additional Settings | Annotations | Arrowheads" you can see that the "Heavy End Pen Weight" parameter is grayed out for all Arrow Styles except "Heavy end tick mark".