I do not see why INTJ™ would be ''exempt'' from romantic feelings / implications to one another (via) MBTI type.
I have ''dated'' / been involved with, I suspect, another INTJ™ - and our relations were rather self-defeating. Typically, we would go 'long-strenous' times without ''talking'' and our conversation(s) were purely intellectual rather then intimate; which I found odd as we were exceedingly trying to build intimacy.
Aside from physical-judo; our ''minds'' where alike, thus we did not really progress anywhere - as very little intimate-judo was commenced, we were always stuck within non-intimate topic(s) while claiming to build intimacy, LOL. (i.e., Lack of feeling expression / emotional-judo).
However, this could have just been a matter of the person - rather then cognitive function(s); however, I do suspect cognitive functions played a role in this regard.
Within his presence, I am not sure if he were exceedingly shy - however, he were so introverted it was like waiting for paint to dry. I have never had these ''hang-ups'' (via) Extroverted / opposite other type(s).
To this, I prefer radical opposition(s) - as other INTJ™ do not stimulate me (via) ''MIRROR'' IMAGERY. I think we ''understood'' ea. other so much, we did not progress anywhere (i.e., exceedingly long amounts of alone time / unpushed intimacy / ''stuck'' in reboot loops).
---> I get you, thus, I won't ''push / question you'' ... Well, damn it, that is the point, eh?! Getting out of the ''platonic'' phase seemed non-existent at one point. Not much help we acquired the same ''functions''.
While ''mind-stimulation'' is NICE - I am rather uninterested in making ''physics'' a prime topic of discussion (via) intimate-judo / relationship(s), as my ''problem'' does not lie with lack of cognitive / intellectual simulation - there is enough of that, on my own - the problem lies within inferior (F) function(s) / out of touch (via) undeveloped function(s), and other issues - where as this INTJ™ could not sufficiently stimulate.
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As for ''non''-romantic-judo, I find INTJ™ interesting in a sense, we ''relate'' innately, and many things are smooth - however, I do not find them ''interesting'' in a sense, that they are stimulating or challenging. Like, perhaps, an I/ENTP™ would supply.
I suspect, I'd be ''comfortable'' / moderately entertained - but bored out of mind constantly surrounded by ''MIRRORS''. (i.e., INTJ™).
Com.