Flying IFR with no radar may as well be VFR? Not if you don't bust altitudes. They won't assign you an altitude that isn't safe (unless they make a major mistake). If you fly your assigned altitudes you will not CFIT..regardless of weather...of course, you could on approach...and on the SLIM chance there isn't radar (if you fly IFR to a minimum of class-D in most cases like me), if conditions are marginal you should be flying an approach...which you are SURE to get on an IFR flight plan and might, maybe, if they have time, on a VFR flight.
Flying IFR there are procedures that have been test-flown to get you up-across-and-down. If weather is anything less than perfect, this helps. Many times a legal VFR day has a ceiling and lower than great vis due to mist, etc. Also, haze can reduce vis with sunlight to nothing. Have you ever flown west into the setting sun, under VFR, in haze, and had no forward visibility? I have. How can you say being at IFR altitudes (99% of the time IN radar coverage)...is not safer?
I don't understand how you can say IFR won't help prevent a midair either. While the FAR's are clear that it is the pilot's responsibility to see and avoid in visual conditions, the controllers in the vast majority of cases will at least call out other traffic.
Also, the controllers won't let you fly with your transponder off (or on standby) on an IFR flight plan -- again, unless there is a rare exception. So, the VFR pilot who takes off on standby gets creamed by a heads-down jet (happened here in Atlanta a few years ago)...but the IFR pilot gets 'Nxxxxx squawk 5434'
Also, the IFR pilot is going to fly at an IFR altitude (for sure -- again, if he isn't busting)...which is separated from other IFR traffic. The VFR pilot flies at a VFR altitude (maybe), and received no attempt at separation at all.
I could probably go on, but if I haven't made my point by now, I'm wasting my margin on carpal-tunnel syndrome.