We used several polled solid red Shorthorn sires over a period of 5-6 years in the 2010s. Over a cowherd that was mostly about 3/4 Angus-1/4 Simmental.
I was warned, from the outset, by friends who'd grown up with Shorthorns, that there are 'two worlds' of shorthorns... the showring, and the real-world commercial-oriented cattle.
We got mostly black calves, but there were enough red-carrier cows in the herd that we did get some red calves, and a couple of cows that were Simmental 'spotting gene' carriers did give some red calves with white markings.
The halfblood Shorthorn steers were some of the best we ever raised.
Had one group that were the result of a progeny test breeding trial we did for Waukaru Shorthorns... our steers went into a feedlot trial of ~150 steers; most of which were SH or SH-X, but there were a couple of groups of Angus and SimAngus steers in the trial. Of the 15 steers we had in the trial, 8 finished in the top 20; overall, all were in the top 50%. One red steer, out of a brown-white-faced 3/4AN-1/4 SM was the top steer overall - YG 3, low Choice, highest ADG, highest WDA, largest ribeye/cwt, highest % retail cut, most profitable overall.
Most of the halfblood Shorthorn heifers were retained, and made really good cows... but there were a couple of SH sires whose daughters were hard keepers or didn't make enough milk to raise a decent calf... I wouldn't use those again except as 'terminal' sires (they had really high WW/YW epds), but the other 4 or 5 Shorthorn sires we used... I'd use 'em again, in a heartbeat.
I definitely think that there are still some lines of Shorthorn that bring a lot to the table, with regard to beef production, and folks who are crossbreeding would do well to try them - especially over black cows. Like others have said, roans or spots will get you creamed at the salebarns around here.