You could also place a ton of oases all over the map, have infinite money, and external taverns everywhere. You could complete the game in just one day. Or you could create a map where you attack a single peasant and immediately win. Is the hint clear?

There are all sorts of speedruns and TAS (Tool-Assisted Speedrun) playthroughs of various games. They fully utilize bugs, use third-party programs, and go through levels frame by frame, etc. The point of such playthroughs is to show the most optimal and shortest route, the minimum time in which the game could be completed. I think the hint is also clear.
What's the difference between interfering with the hero summoning in the tavern and interfering with the warrior tombs? If some player creates a function "invite an artifact in the tomb," everyone will immediately use this trick without a second thought, but if you make changes to the map, oh no! How can that be?! But essentially, what will be the difference?

Added after 4 hours and 27 minutes
Hehe, and on the "Everyone Fights" map, you can even earn 500 points. And that's rare.
The fastest map in Heroes is probably "Always Ready!", where we are given a fully developed city with a Grail right away. It can be completed in 2 days.