Yes and we can bring different shafts, tips, and hell, have you seen Earl and his elbow protection/weights LOL? But we can't swap out cueballs willy-nilly, or racks if the other player objects. That is the core of the issue here, not so much if it's better to use this or that, but given the guidelines provided, which is other tournaments having a set rule for rack use where both players have to agree (outside of CSI which explicitly notes that you can't deny use of the MR, but seeing how they are distributing the thing and it's mandatory in the 9 and 10 ball we can probably leave that out as a factor), plus the fact that there was no rule given out that any of the players can use any rack and you can't say anything, I just don't see how the ref or TD can allow the other player to use the MR over the objection of someone.
Plus we had a CSI trained ref say in the situation given "no way would I allow the MR to be used".
What if one guy wanted to switch tables but one did not? Say if they were assigned that table by the tournament director, Mr A and Mr B, table 4. One guy did not like how the cloth looked and wanted to switch, Mr B said, no I like that table. Then what? If the table was technically fine, no rips, rails were normal, etc... would it be OK to force the switch? I am going to guess that no-one can say "yes force the switch" with any type of solid reason. That is the same thing here, if the rack they used was good, and one guy did not want to allow use of the MR, it should not be over-ruled and be allowed. And if the rack was NOT good, then a suitable regular rack replacement should be found first before they use the MR.
As a neutral party, discounting your own preference for what rack to use or what YOU would do if someone asked to use the MR, with the fact that there are a lot of other tournaments and areas that already made the ruling and said BOTH plyers have to agree and that is the call that a ref would make, there is really only one correct ruling, and the TD in this case did not make that choice. There is huge amount of evidence one way, and mostly personal opinions the other way.