Can a Quality Full Range Speaker be the Limiting Component in a system?

I am having trouble not reducing this down to a very simple question:

"Are quality loudspeakers ever non-linear"

to which the answer is of course yes. But if you want some simple terms, how about dynamic compression? That is, +3dB input results in less than 3dB increase in output. Very common situation which many speakers suffer from.

Best,

E

If the question is referring to full range speakers meaning full range single driver speakers, some of the higher end Lowther drivers claim a 20Hz-20KHz frequency response. So I suppose they technically exist. Same for full range speaker "systems". So the question then becomes a measurement issue as whether or not every component in the audio chain can deliver the entire frequency range. If so, then theoretically there's no bottleneck.
The problem is if we mix the notion of the sound quality with measurements, then the discussion becomes completely subjective and there's no single answer to the original question. 

@inna I’m actually referring to prices as new and yes they are $50k speakers in a $500k+ system. Magico Q3s actually. My point is that decent speakers at this price level are capable of really great performance if matched well, and I’d rather invest in better sources to get more information for the speaker to work with (call me Linn school) .

In addition larger speakers would overpower my room, I could go to M3s for example (and probably at some stage will) but anything bigger would cause me so many problems

So back to the OPs question if your speaker is showing you the impact of changes elsewhere in the system, and if you can work within the frequency limitations of the speaker (for example mine may not have everything in the bottom octave but the acoustic design of the room helps here) then don’t go chasing a speaker change which will likely throw the rest of the system out of kilter

Speakers overpowering the room is an excellent reason not to have them, agreed.
I am a Studer school too, folkfreak, but probably not as much as you are. $50k speakers in $500k system - no, but $5k speakers in $50k system - no way. $50k still buy a lot of a speaker.