The logistic of kissing the stone is probably why. People fight to kiss it and end up dying especially the old or those who bring children
When I go, I'm going to do all three. I'm old school. Screw someone else killing my animal for me
You can't change the date, that is set in stone because Eid is set in stone.
The Hajj formally begins on the eighth day of Dhul-Hijjah (the 12th month of the Islamic lunar year). It is during this month that the annual pilgrimage to Mecca occurs. Prophet Muhamamad himself sanctioned the first ten days of this month as a special time for devotion. All of the rituals cumulate on Eid < More complex but short and simple version