Personally, I think TOL is far more difficult to pull off than TR,
TR leans heavily on other instruments , piano especially, MK can potentially get away with barely playing until the end, especially with the arrangement they did in the solo tours, and as others mentioned the end solo is fairly open. He can play largely what he likes aside from a couple of key licks here and there , you can also slow down TR overall without as much consequence.
TOL has far more noticeable in between licks on the guitar throughout , faster tempo , and aside from the end solo, there is also the middle solo which really has to be on point and rhythmic to work well. I don't think 2010 mark could have pulled that off let alone 2019! I think as well this tune just didn't fit the MK solo vibe, it's stadium rock (at it's finest!)
People are saying that the MK solo band couldn't have pulled off DS as well, and that could well be true, but ... they were also chosen for the band for that very reason. MK picked them to create the sound he wanted which was to get away from DS.
I think he could've played more DS tunes throughout his solo live career , that version of WOL in 96 is a classic example. So cool! But I understand with each album there is more music and that makes the setlist harder to write.