Well, you know Xc - is frequency dependent, so Larger values of C, you'd think that it would PASS larger values of the Frequency of choice.
Same can be applied for divider networks for Tank circuits. You have to meet the output of the Final correctly - in order to "load up" the output Tank, and then that "tank" has to meet with the output PI filter networks and then appear as a 50 ohm unbalanced load ready to be coupled to a reactive antenna load.
In the Bipolar realm, you have a wide variance of power levels and their appearance as a reactive (Read this as Conjugate) impedance change into the Tank Circuit. IF you didn't get it right, the easiest way to tell was that "Backwards swing" you'd have on the meters. So you turned the inductance slug to better meet the transfer admittance into the output network.
So it bears to mention that if you wish to couple any MOSFET to an output network and provide the proper filtering let alone the swing in characteristic impedance from it's output - then yes, you'd need to IDEALIZE the tank circuit to allow the best power transfer into the output network. It's not a Bipolar response, its' MOSFET and similar to a Tube tank design than a Bipolar one.
I can see why they do this, to offset the older Bipolar rework and provide better power transfer - but there is a cost in several ways on this approach.
You don't get something for nothing...
Losses in power transfer because of larger values of C give you a "Resistor Divider" effect - where your power output is HALVED the closer in values the two Xc's are approaching each other.
This can work in your favor when it comes to power level averaging to provide a better admittance window into the next stage - like a larger amplifier of greater Gain.
This was one of many problems with driving Analog, Linear, BJT amps with MOSFET designs - they literally CAN - SPIKE the input of the amp with PEP's that exceeded their input window or Safe Operation Area. (SOA)
Another hit comes from the Admittance losses, the reflection hit - against the preceding Output power stage, if it's not idealized, the power transfer isn't fully completed, some losses are incurred as heat and power dissipation - but a vector of power is caused by the miss-match - that can endanger the previous stages ability to provide power without getting blown up in the process.(High SWR mis-match in coupling of the two stages).
In using this - you lose a power curve swing for say, SSB use, but you need to also look at this as Reciprocal, this may help SAVE the Finals from the poor Miss-Match from a poorly loaded antenna that will place - return as, reactive elements in the system, CMC onto Harmonics reflected power that needs to be sent somewhere before it strikes the Final.
IMO...
