@vl82m,
Hard to explain where the interest originates but some of the following factors are involved at least for me:
1. General interest in Soviet-era aviation.
2. It's a unique, infamous airliner with major attributes that are unseen in almost all other civil aircraft.
3. I enjoy the quality of the addon. It's a systems simulation of something from decades past, and that alone interests me. It's Soviet origins and associated systems, which differ significantly (in some ways) from standard Boeing and Airbus types are interesting to me.
4. Even though I'll never understand everything about this addon (and it looks like many in the Russian community have difficulty as well), knowing that I can at least figure it out enough to operate it in reasonably safe and competent manner (I realize that's subjective) is rewarding to me. There seem to be very few in the flightsim community, and even fewer "foreigners" as you put it, who have attempted to learn to use this aircraft.
So, part of it is in my general historical interests, part is in my enjoyment of complex addons, and part is in the exclusivity of being able to operate this specific addon within the flightsim community.
Fair enough, the Soviet Navigation at least comes with it's benefits, keeps brain working and flying to the badly equipped airports with just one to two NDBs for approach while coming from a navigation system that might have drifted a bit is a challenge, but with some corrections all landings are safe in the end. All it needs, is practice. Like with the Tu-154, and the even more problematic Tu-134 with less accurate systems and more workload.
Aside from the bugs, I guess you have managed to flown the v2.0 version (not 3.0) with the INS system and made perfect flights? Not operated in a safe manner obviously, but without fuel shifting wrongly and causing the flight to spiral out of control which is typical for most people.
About parachuting, military aircraft still use them. Last civil maybe was Tu-154, I heard it used them while still in developement and testing but can be mostly rumors.