While I agree that ancient Rome and current times have many differences (the ones you point out), however there still are many lessons to learn from that period. It's not the particular people that should be compared (Crassus vs Trump for example), but instead the processes happening on the ground. And there you can see a lot of similarities. While any analogy breaks down the deeper you go, the higher level processes can be quite instructive. The map is not the territory after all. However, the models can be useful. I actually wrote several articles on this, with my deepest analysis probably being this one: https://gainweightjournal.com/11-lessons-from-the-fall-of-the-republic-it-is-disturbing-how-relevant-they-are-for-today/