No HCG, no AI, yup. I think KISS is the best approach, unless otherwise indicated. For example, a man who wants to keep fertility and nad size up, needs HCG. In my case, don't care about either, and if anything, the suppressed sperm count a plus and smaller nads make your penis look bigger.
My E2 tends to stay in a range that would not warrant an AI, and I think many have found, use of an AI often does more harm than good, and for most, E2 can be controlled via fat loss, change of schedule, etc. I know there's the debate that HCG supports some pathways suppressed by TRT, but also seems subjectively, hit or miss in how men feel, and that's one more cost and thing to worry about.