Continuity is the cause of danger and the need for bonding.
It would be better if ALL the pipes entering a bathroom were fitted with isolating plastic sections (ideally a bit longer than a plastic elbow) then all the pipework in the bathroom would be electrically isolated.
No earth paths, no touch voltage, no bonding - definitely no bonding, no worries.
So, when you have a pipe which has been electrically isolated then purposely connecting it again MAY be reintroducing hazards which had been removed.
What are you on?! Continuity is exactly what we need to EQUALISE the potential between all extraneous and exposed conductive parts.
230V on the bath tap and 230V on the basin tap means no potential difference between them and no belt if touching them at the same time.
A lovely little idea these plastic isolating sections! How are you planning on isolationg the rather conductive liquid running through them though???