Why are you so averse to having what you call technical definitions. The whole point of definitions is to ensure absolute clarity concerning the issue at hand. If one doesn't maintain absolute clarity there is room for confusion. An example of this would be the following:
Say we were to try to prove some theorem about triangles and it started...
Let P be the centre of the triangle.
Now, to the person initially writing it this might seem absolutely clear in meaning. But does this person mean the incentre or the circumcentre etc?
Doron, dealing with the concepts of Infinity, Number and Limit in a formal manner isn't a cop-out. Rather it is a means for all involved to know exactly what is being considered at a certain point. This is where much of your explanations don't have any formal definitions that would ensure absolute clarity.