Never liked those tiny removable driver tips on a multitool. Too fiddly. Too easy to have the tip fall out and get lost in the dirt. I much prefer a straight, fixed driver tool. A couple of assorted flat blades and a #1 Phillips is fine. I'm not going to be doing any production work so I just don't need a wide selection of driver bits.
I have always been able to muddle through with a much more limited selection. I can't remember any field situation when I couldn't make it work because I lacked a particular bit. I have tightened a number of torx,Robertson or Allen screws by gripping them with the pliers or forcing one or both of the long-nose points into the recess to gain a purchase. Or I wedge one of the other blades into it. You won't get it super tight and I gall the fastener that way, easy enough to replace when I get back, but it has always worked well enough.
If and when I really do need to have a more comprehensive selection of drivers for production work, like when I building something, I break out my tool kit and I'm good to go. In the mean time I don't need to be hauling the extra bulk and weight of a set of hex bits around.