Yes, most of us are doing high end ENG/EFP work and would like to have a porsche to do the job instead of a chevy. No excuses made on location is a major reason.
The FP42 is a solid mixer, but all of us who have used Shure mixers from the FP31 and FP32 on up, have seen Shure's products surpassed by other manufacturer's that listen to our wishes for features and improvements. The FP42 is not really a true ENG field mixer especially with
bottom facing the I/Os and the permanent AC cable dangling away. The FP42 is more effective as a field editing mixer or rack mounted in an RF or Sat truck. Shure's sales engineers never understood why many of us don't see the FP42 as a valid replacement for the FP33. Shure FP mixers are also notorious for dirty pot problems and a high level of self noise.
Now that some of us are recording HD at high sample rates a "quiet" mixer is a must. The Coopers, 442, Wendts & PSCs just fit our needs much better.
The newer generation 4 & 5 input mixers all have 10 pin ENG breakaway outputs in addition to
2 main XLR outs. Some have 12v outs for powering wireless units, some have more than one headphone and/or tape outs, most have more functional controls for phantom powering etc than the Shure provides. It all comes down to features, features, features or we'd all still be using the FP33s. Its worth the extra cash to have a versatile mixer that acts like a Swiss Army knife that can do whatever you need on that unforseen occasion when you need an added feature.