(Please do not merge that PR without re-reviews. Those reviews from October are stale.) We can’t kill

list_targets_old.py

until we require all plugin authors to write Target API bindings for their targets.

list_targets.py

fails to work with targets without bindings, whereas

list_targets_old.py

works with any V1 target. So, we need this until 1.30.x at the earliest, depending upon when we put out the deprecation warning that you need to write bindings.