Peter Duniho wrote:

Well, one thing I wonder is how ATC's obligation changes if you report the
traffic in sight. That is, if they are providing you with separation
services, but you can report some traffic in sight, maybe they then do not
have to provide you with vectors. Of course, for VFR traffic this is a moot
point, but if they're in the habit of doing it for IFR traffic, they might
still do it for VFR traffic.

ATC maintains the responsibility for IFR-IFR separation unless you hear
"maintain visual separation from that traffic...".