Yeah I'm sorry, I guess I don't see the point of teaching people bad habits just so they can steamroll the Noble AI and get an ego as apparently oversized and misguided as yours marigold.
Look, it's a strategy game. This is a strategy forum. OP asked for advice on strategy. The one-dimensional 'strategy' you offer works at best in limited circumstances and even then is sub-optimal in many ways. It's fine to
point out that you can roll over the low-level AI just by spamming cities and troops, and even to recommend this as an exercise to get used to warring; but to present this as an actual strategy with no mention of its drawbacks or the merits of the alternatives is just misleading, and frustrating from the point of view of those of us who would like to help new players get better by understanding what solid play actually consists in.