You raise an important point about law-breaking by drivers.
The arrangements at the junction of Beech Grove, West Park and Victoria Avenue have not changed, and some drivers have always ignored the ‘left turn only’. The number doing so may have increased.
Beech Grove itself is MUCH safer and more pleasant since the modal filters were put in. The response to law-breaking by drivers should be police enforcement, not removing a valuable active travel scheme.
When NYCC build their Victoria Avenue scheme, this junction is likely to be changed and the problem should be resolved.