worthwhile or a waste of time practices.

[mapper]

The further I get down the reloading rabbithole, the unanswered questions and diffrent opinions on procedures used ( especially the why behind it) seems confusing.
I have gone from plinking loads to trying to make match ammo. So it has progressed beyond basic loading.

And in each of the cases below, I have seen differing viewpoints, and it is getting harder to separate the worthwhile practices from the voodoo..

This is all in relation to rifle cases, and the intent is to produce match ammo for shooting groups for score,

So with that said, I would like to know what is important and gives the most benefit, and what does not, with the following assumptions:

All brass is same headstamp, same amount of firings,

When to consider annealing necks (on which firing)

Primer pocket uniforming: worthwhile or not

Flash hole deburring: worthwhile or waste of time

Turning or reaming necks: worthwhle or not

Using bushing dies with out an expander ball,
Or collet dies, or standard dies that are honed out in the neck
Worthwhile or not

Using premium brass like lapua or norma or equalavent

Checking and correcting runout

I know some go to more than this such as weighing cases, bullets and sorting them,
Measuring length with bullet comparators, and sorting

But I'm not ready to go do any of the above except for premium brass, (because I have it) if it does not make any REAL diffrence.

So, for the folks here that have either tried this before, or do it and notice a improvement, I would like their opinions.
I'm asking because I would honestly like to know how to make the best ammo I can for the time involved.
Thanks. I haven't seen this in the reloading 101 books I have, but have seen it on a sierra video of David Tubb loading ammo..
(I'm no David Tubb)