2.5 or 3 way; why one over the other?


So, in my research, I see several well regarded Manufacturers making both 2.5 and 3 way speaker systems in the same product series.  Often they are close in height (floorstanders) and footprint and presumably use comparable quality components.  Please help me understand the pro's and con's as to why one would choose one over the other.
larstusor
@larstusor

With a 2.5 speaker the woofer and mid range are the same size. With a three way speaker the woofer and mid range are a different size. They both have two crossovers. I have owned Spendor 2.5 way speakers and they were outstanding. From what I gather that is the difference between the two types!
@yogiboy 

A 2.5 way is missing 1 filter section. The "mid" has no high pass filter. 

Typically, the two woofers are the same, but Focal and possibly others, have used slightly different models. 
@erik_squires
Take a look at this Spendor. Does the mid have a high pass filter? What Focal is a 2.5 way? Am I missing something? If so please explain? Thanks!
https://store.acousticsounds.com/d/94323/Spendor-Spendor_D7_Stereo_Speakers-Speakers
@yogiboy 

In a 3-way the midrange has 2 filter sections. A high pass, and a low pass. 

In the case of a 2.5 way, the "midrange" is missing the high pass filter. 

That is exactly how you define the 2.5 way speaker system. 

The woofer and tweeter filters are otherwise the same in either. 

I'm not sure about Focal's current line up, but the Focal Profile 918's were an example of a 2.5 way.