Because the Jews only have one G_d, sacrifices should only be brought to the Tent of Meeting. They can't do it at home.
This reminds me of the Buddhist koan below:
CASE #20: Indra’s Grass StalkI read the koan as meaning that any place can be a temple, and any thing can be a temple. Are these opposing statements to the Torah? Much of the Torah seems to be telling Jews that they need to do things differently that the people who enslaved them.
When the World-Honored One was walking with his assembly, he pointed to the ground with his hand and said, “This place is good for building a temple.” Hearing this, the god Indra took a stalk of grass and stuck it in the ground and said, “The temple has been built.” At this, the World-Honored One smiled.
But this isn't just about being different. It is about being precise. A famous economist (non-practicing Jew) used to lament how we had so little self-discipline today. I was happy to hear that Buddhist monks break their vows all the time. As long as they commit very minor transgressions, all they need to do is to confess to another monk. But something more severe requires that they might be banned from the zendo for a month. And there are a few acts that immediately defrock them.
Rules are precise. I suspect this rule of only doing offerings in the Tent of Meeting came because people were side stepping the practice and getting lazy. And further, I suspect that since the offerings were a means for the kohens to be sustained that it was especially important to make offerings in the Tent.