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The alignment bars are good for diagnosing a problem, not so much needed for when you set something up for the first time, although it wouldn't hurt."
Actually, the alignment bars are necessary in order to AVOID problems in the first place. I would put the torque screw drivers and lapping bars at the bottom of the list.
The number one scope problem is screwed up erector systems cause by mounting scopes without checking the rings for alignment. This is especially true when using the Redfield type turn in rings. It's true that most anybody can get the scope on the rifle with just a screwdriver, hex wrench and Loctite and a lot of times it will be OK but, a lot of more times it won't be OK.
How do I know?
I learned the hard way. There's never time to do it right but always time to do it over. Sort of like the construction workers rule of measuring twice to cut once. Amazing that some folks recommend not measuring at all. Ask any gunsmith.
Bruce