Come-on this is not rocket science. How can we excuse a $49K car where you can't "secure" anything in either the trunk or frunk. This is poor design, plan and simple. The competition (Mercedes C-class) only allow the fold down seat to be released from inside the trunk, and cockpit release button is disabled if cars not started.
Tesla should have known about this problem and addressed it on the M3, since it's so common a problem on the MS.
No it's not a deal breaker, but certainly Tesla should have designed a more secure trunk/frunk.