Speaker height...should known better

+1 @lonemountain I agree. It can be simply overlooked knowing it is simplest of tweaking. 

Anyone over 185 cm tall has this problem. Speakers do have a recommended listening height and it’s always designed for a very low chair and the average height of a 19th century person. 
Tilting the speakers becomes impossible if you have special footers. 

A good rule in proper speaker design is the tweeter above the midrange, midrange above the bass driver.  Its where the drivers combine (at crossover points) that the dispersion of the speaker is determined.

Some designers routinely mount the tweeter below the woofer to better time align the drivers which also results in a simpler crossover network. I think its a much more novel and effective way of doing so sonically, eliminating extra crossover components and the only real consideration is proper placement. There is also consideration given the subject of lobing that is rarely brought up in these posts involves the relationships between the upper and lower frequency drivers on the front baffle, the cross over network along with the listener’s listening position relative to the speaker system as a whole. The designer has taken that into consideration throughout the design process.

Oh, and always having your tweeter at ear level is not always the best thing unless the designers actually intended it to be that way which most of the time they don’t.

I’d say most of the time with dome tweeter cone woofer type set ups they DO want the tweeter above the next driver down.  As these drivers combine output it can often give this very wide horizontal and a medium to narrow vertical plane pattern, with a downward tilt to the combined output. So actually the acoustic center sitting in front is ears lined up between the mid and tweeter or a few degrees below that.  One of those leveling lasers works really well to determine this spot at distance.  With a two way, then the acoustic center is usually midway between the tweet and LF driver.  
NOW exceptions abound.  A horn and cone combo behaves differently due to the pattern of the high frequency driver and then how it uniquely combines to alter dispersion at crossover.  A planar tweeter of any type will exhibit yet different dispersion characteristics as well and the resulting combination at crossover in the room is unique to that design.  For those working with speakers everyday, consistent dispersion is preferred. 

tweeters should be pointing at your ears.    I repositioned my Vandersteens that way and it made a HUGE difference for the better