Some of these animations are critical ques for raid mechanics. Especially in elite plus. For example in TSWE+ raid, The One Who Laughs used to laugh/dance and teleport to a tendril for his pull mechanic. An update deleted that dance animation. Again in same boss fight The One Who Laughs used to dig his hands into ground and spawn the tentacles. That "dig" animation is not there anymore. Another example Felix Faust used to do a "drop smokebomb" animation before his teleport. Now he doesnt. This one is not that important but there are various animations in entire game like these(or at least coded like these ones). I cant pin point the exact update which caused this but I know it is after SoBA Episode release. Because I know Felix was doing that smokebomb animation during first couple weeks.