Manufacturers of cgms only need to jump over the safety requirements demanded by medical device regulators (like the UK's Medicines and Healthcare Products Regulatory Agency) and not what is or isn't permitted in court during a jury trial.
To be fair to both Dexcom and Abbott, I believe they now both have features where you can "pause" most (but possibly not "critical" low) alarms for up to 6-8 hours. The ability to do this with Abbott cgms is only available in the USA at the moment, which is the only country where Abbott have rolled out their new "Libre by Abbott" software app.
And I believe users can simply turn all cgm alarms off (not ideal if a diabetic wants to be notified of every alarm).
It would help if medical device regulators would allow cgm manufacturers to have a "vibrate only" alarm setting. But I guess not one ever asks for the real world opinions of diabetic lawyers when these products are being designed, or before they go through the regulatory process.
Judges are becoming more cognisant of the fact that lawyers, witnesses and jurors who appear in their courts may be diabetic and may wear medical devices that might alarm, etc. It is always best to make that known to the court (court ushers are usually very helpful) well in advance, to see if any accommodations can be made.