Is there any reason not to have tube phono stage ?

Is that the only reason (RF) that increasing the load resistor value appears to brighten (open) up the top end of a MC?

@noromance If the load resistance is too high, the resonant peak can still make energy. RFI really messes with audio electronics; the more gain the more it seems to affect it. We're talking about this RFI injected directly into the input of the phono section via the tonearm cable itself. 

If you were able to install an RF filter than went low enough you'd find the problem eliminated in that manner as well but its easier to design the phono section to be immune to that in the first place. 

 Not really, a good ss phono stage is designed not to overload in the way  @atmasphere has outlined, a cheap one Wii have issues.  A cheap tube stage will also sound bad.  However, cheap and inexpensive are not the same thing.  For under $1500 the Hagerman Trumpet MC or MM is a great product.  
 

 Not really, a good ss phono stage is designed not to overload in the way  @atmasphere has outlined

@oceanica 

A simple way to know if there is a problem is to see what 'cartridge loading' provisions the preamp has. If a switch on the front panel, its a good bet the preamp would otherwise be affected by the RFI previously described. 

If it does not have a problem with the RFI then there would be no need for the 'cartridge loading' provision unless the preamp was to be used with a high output MM cartridge.

@atmasphere

Interesting, I hadn’t thought of that.  Though many (tube) phono stages have a load selection on the front panel, and thus have a ss input for such selection.  Could that be overloaded in the same way?  I am thinking of my Trumpet MC.  I have found that with or without a transimpedance head amp, I can run it “wide open” at 47 kohm and get no ticks or pops that aren’t on the record.  I have found that with certain cartridges though, it was possible to get the phono stage to clip in a more typical way if the gain was too high in the head amp.

 I am interested to hear your thoughts on this.

@oceanica The concern is RFI messing with the input of the phono section, possibly overloading it so you get ticks and pops as well as brightness. 

If a pre-preamp is used and it overloads the input of a phono section, the RFI isn't there so that's a different matter. 

All the load selection does is place a low value resistor across the input to the phono section- its in parallel with the cartridge so the cartridge has to drive it. But it detunes the resonance, thus killing the RFI. 

Hagerman is well aware of this problem so I'd be very surprised if their preamps had any troubles in this regard.