If correct rest is observed as regulated by the authorities then safety should never be compromised but when you bring in other factors such as bunching of work and commuting the fine line can lead to mistakes.
WW
In other words: " We want to be able to roster you to EASA limits, (which of course must be safe) but that pesky thing called Bidline is getting in the way...................."
Moving on
I'm glad you have concerns about crew members "bunching work" and I take it you've already expressed concerns up the management chain about the company's longstanding practice of constructing eastern seaboard "back to backs" for our cabin crew colleagues. For the benefit of the non BA readers that's a trip construction along the lines of LHR-JFK-LHR, night off in London, then LHR-BOS-LHR. That certainly looks like a "bunching of work" to me.