Yep,there really isn't a need for cobalt drills unless you are drilling a lot of stainless,even then they don't offer much advantage.
A good HSS drill will drill nearly anything that is drillable.
For all the stuff that doesn't drill to good,I buy carbide masonary bits and sharpen them on a green or diamond wheel so the cutting edge resembles that of a 135* drill.
With a slow speed and water based coolant they will drill leafsprings,insert toolholders and even some bearing races.
Just be aware that they are not sized and will only produce an approximate hole.If you need anything of any aaccuracy then you will need to grind the sides for the proper diameter.
I have had excellent results from the following brands Bosch,Dewalt,Hilti and Hitachi.
I just need one more tool,just one!