@NimzoMalay -
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Variants like Bughouse, Crazyhouse, 3 check, King of the hill, Live 960 introduced to live chess.(your original #2582 statement) – There is no reason these variants cannot / could not be introduced in to V2. (from my statement in #2593)
What made you come to the conclusion that these variants can be introduced in V2's live server? Last time I checked, Chess.com wasn't open source, so I take your argument as a guess. (per your rebuttal in #2613)
– Irrelevant. Check your premise, you will find it deficient. Being open/closed source is irrelevant as to whether it can be done or not. Knowing how to code is about all the information one needs to know whether it is possible or not. So, no, my argument is much more than a 'guess'; it is erudite and logical.
The primary reason why they had to upgrade from V2 to V3 was to write new code from the ground up to support various new features that were impossible to implement in V2. (per your rebuttal in #2613)
– Again, irrelevant to the topic. Necessity to upgrade does not correlate with the choice of what functions or features to develop in existing or future versions of software. The excerpt you quoted, "The latest web technologies let us add features we could only dream of in the past", is as immaterial as most of your arguments here-to-fore. There is nothing to say they (the chess.com coders) could not have re-coded V2 with the same 'latest web technologies' (and also add in those same dreamy features) and kept the same user interface to which we are all accustomed .
Sometimes there is NOT a pot of gold at the end of a RAINBOW , just sonorous snoozing , which is unusual when "comments" emanate from diurnal waking-time "Northern Hemisphericals". I would include the OTHER hemisphere but Morpheus seems to there reside. Seasons Greetings to all that anticipate a fun '17year !!!