I think (personally - your opinion clearly different) it is a stretch to designate this as a safety issue.
How many reported accidents have occurred as a consequence of the ignition turning off?
We also have seen the low fuel light to be questionable - if you run out of gas and engine dies, does that make THAT a safety issue?
Continuous improvement of ANY feature is not necessarily an acknowledgement of something that is deserving of retrofit to the latest design.
That being said, Triumph did issue a retrofit to 2010 Roadsters to bring them up to 2011 spec in that particular area and begs the question, why upgrade those models, but not the earlier ones?
(the exact same retrofit could have been applied to the pre-Roadsters)
But at what point does 'poor' reliability become 'unacceptable' and deserving of either a wholesale recall, or even a 'goodwill" upgrade on request? (the latter might have been a good option for Triumph to take)
just outside of Warranty? 4 yrs? 5 yrs? 10?
What % of bikes failing within that 'catchment' period then makes it worthy of a 'free' upgrade?
Remember also there is no such thing as free lunch - somewhere costs must be recovered otherwise companies go out of business.
For me, if it fails within a short period after warranty has expired, that is a reasonable grievance and you would be right to appeal to Triumph; a year out of warranty or longer and I think well, that sucks but what can I do to make the situation better.
Incidentally this is not a uniquely Rocket 3 issue - the same scheme exists on many, many more Speed Triples, Daytonas, Sprints, Tigers from 1997 through about 2010 which all utilize the same switch and the same current feeding twin headlights (although some of those models would not have the additional Fuel Pump current).
Some rave about Japanese electrical reliability as a beacon - I can honestly say the electrical system on my Suzuki TL1000 is one of the worst I have come across - no relays, woefully under-sized wiring and connectors, resulting in burned connectors; same on my SV650 - a burned connector on the headlight circuit there is also a well recognized issue.
Look - I'm NOT saying this is a non-issue - I would definitely recommend a bypass of some sort to minimize the possibility of failure.
The simplest and least expensive is addition of a single relay, essentially emulating the same scheme employed in the 2010 Roadster retrofit.