Fair enough, but you can't only look at NCAA tourney results so heavily as obviously there is so much context and variables involved in assessing a coach. Using that sole argument to immediately dismiss three coaches isn't very deep without further context behind why they are/are not good coaches. I'd argue some fairly successful coaches with great talent and some NCAA success in the tourney are actually average to bad coaches versus some less proven guys in the tourney that have better maximized their situation.
For Musselman, I just believe he is good coach that has excellent offensive acumen and that he could parlay that well into Big 12 play. I'm pretty sure for Weir I know about 1000% more about him because for one I know he has only been a head coach two full prior years so 1/3 is very misleading and outright wrong. It's his third season starting now, but as I said, he's not ready but I think he's got potential to be a good coach down the road and let's see if can rebuild the New Mexico program. I wouldn't chase Buzz Williams but not because of his NCAA tourney record.
Shaka is recruiting well, but I can't believe anyone with real basketball acumen would argue he is a great tactician. It's pretty obvious, and so much so to me, I will never really argue the point as I think that's a waste of time. Whether Texas could get anyone else better IS a legitimate argument, and I don't know if there are a lot of good choices out there. Shaka himself of course had the one magical run, but he also was at a non-power 5 program with four straight seasons trending down for the most part with mostly a worse overall record, worse conference record, and less success year by year in the tourney going from 2nd round, 2nd round, then 1 and out, and 1 and out with those last two years being upset as the higher seed against a double digit seed. I'd also argue Will Wade might have done as good a job if not better with VCU after Shaka left considering the overall situation.
I think Texas is not the kind of program that can easily hire someone with huge NCAA tourney success as it is and/or they wouldn't leave their program for a lateral or downgrade move, so I think you have to have some risk involved in hiring anyway. If Texas was a true blue blood, you can go after anyone but the basketball program is not the football program. I'm realistic enough to believe it will be very hard for Texas to crack into this group consistently but I do believe we can have a program that is challenging for the Top 10-15 consistently with an NCAA appearance annually with the threat to make the Sweet 16 every year. Maybe once in a while, we get a magical recruit/run/hot streak that cracks into the Elite Eight and beyond.
Shaka's now 23-31 in Big 12 play. I don't think it's unfair to say that with the available talent during this run that 23-31 is disappointing. I think a legitimate worry is if another coach can recruit this well, but I'm not worried we could find another coach that can at least hit .500 in conference even if recruiting is not quite the same. I still am happy to give him more time this year and see if he gets better, but it's equally fair to critically evaluate his tenure so far as underwhelming.