So in my experience, intitially Is and Es don't really appear to be quite so functional, but when it maps out properly, in my experience, some of that "conflict" is actually a very rewarding ground for both types to cover/defend, and actually produces a "spark" that does more to contribute to the actual attraction. The way that Es generally are, once they find their confident introvert to bang away on, just cannot believe what they have found. To find a person so comfortable to enter a space in their minds that they are reluctant to and be willing to talk about it. For an introvert to get ENERGY from those inward-facing spaces might actually drive some extraverts wild.
Now it's really hard to account for how those relationships initially grab ahold and root themselves is the thing, but I can say from experience that once that attachment forms, the percieved "conflict" is actually hilariously rewarding to behold. It may even be more fun to be an introvert when you have an extravert railing on you and trying to pull you into experiences to get your unique reaction. It's the same for introverts, I mean, I love pouring my various ideas all over certain extraverts if for no other reason than to watch them squerm and bang around them with you! It's so hilarious, and it never really stops being engaging.
So I'm close friends with an ESTP. I offend every little thing that this ESTP represents, and I do it confidently. This drives the ESTP... MAD! The ESTP occasionaly will admit to me that there is something about me unlike other people that they just don't get bored with. This is highly contrary to what I would expect... I do not consider myself a "fun" person. It's just not something that I feel like I relate to. Sometimes you hear people express what they want and they'll say things like "I just want somebody that wants to have FUN!"... And I'll say to myself, "uhuh... really... well... I don't think you are looking for me... moving on..." Well, often the people saying that may be some SJ type looking for their world to be lit up by an SP, but in many other cases, some of the spazziest extraverts are really just spewing something nearly meaningless, and who knew that the most engaging thing in the world for them would be their brain-rapping introvert. Me and my ESTP friend argue almost non-stop, and it continues to be hilarious for me, and it never stops being boring for them. Of course it doesn't have to be "arguing", but I'm just illustrating that their is sometimes a conflict-like "spark". The thing is, is it isn't truly compatible, since the negative parts of the ESTP, like the "wheeler-dealer" and "taker" part of them weigh down on me in a very draining way, and perhaps with an ISFJ, the ISFJ maybe distantly values that "go-getter" "wheeler-dealer" bent...
I see it all of the time. Just look at a lot of the mature couples surrounding you. The majority of the whole world is made out of SP-SJ relationships, and pretty often, one of them is an introvert as well. They are on the same "wavelength", and yet, there is something very balancing that doesn't step on the toes of the other's more overt traits, and they are not only better equipped to stomach the "negative" things better than someone perfectly similar, but that may even contribute to the "spark".
Even outside of E vs. I relationships you can emulate that "spark". NFs in relationships with NTs, even when both are introverts, can be really rewarding. On one angle, you still have someone you relate to strongly and is on the same "wavelength", on another angle you have someone that you feel there is still a very large rewarding ground to cover that sparks conversation, and then the other imporant angle is that they aren't too similar in a way that starts getting underneath your sking(which is a way bigger problem than you might expect). So to be able to combine that complimentary "wavelength" with the hilarious parts of introvert vs. extravert that maps-out type-wise properly(with directions of functions and so forth), then you may have something very rewarding.