So you are saying they introduced 3.0 to reduce performance on the Equinox so as to not hurt sales on their $2500 CTX dinosaur (not a cash cow for them BTW)? Yeah, I thought about that for 2 seconds then came to my senses. To be fair, I know that's not exactly what you were driving at but is one way what you said could be interpreted. I actually have an alternative theory on 4 khz (and it is not the Asian horde hunter baloney ML put out there). I think 4 khz was put out there to field test some alternative signal processing algorithms that ML might be considering for future detectors. Perhaps a Multi IQ-based CTX replacement. 4khz definitely appears to run hotter but with less chatter than 5 khz in my A-B comparisons on high conductors. It's not the end all and be all, just another blade in the detecting Swiss army knife that is Equinox.
I am betting that ML will introduce a higher-end Multi IQ machine with the sophisticated discrimination patterns and target ID scheme of the CTX. Yes the eTrac and CTX are silver slayers but are left wanting on mid-conductors and do not have the recovery speeds necessary for bed-o-nails type conditions the Equinox can handle and which are the last bastion of unrecoverable keepers. The FBS2 detectors are rather expensive and slow one-trick ponies that are anachronisms in a fast-paced, quick edit detecting era IMO. But Equinox is definitely not their equal on accurately IDing deep silver under ideal ground conditions.
But to my point earlier, I see no reason to hold back on these bolted on cutting edge features which have been implemented in a manner such that you are free to take them or leave them. You can choose not to flip out those additional blades, but the other existing blades in the knife are unaffected so why not have them there just in case.