No, there isn't. You are talking about a few ounces, tops.
No, none whatsoever. You could leave the bulb, transformer and BRCB dangling the whole weekend and it would not affect any part of the installation one whit.
When strain relief *serves a purpose*, that's an appropriate use. When there is NO strain, as in this type of installation, there is no strain relief fitted because the trade and the regs people recognise there is not a problem.
'Bout time you did, too!
MM