I pretty much agree with this. There are definitely circumstances of special concern, but I typically prune/top by exception, or proactively when I know the growth habits of the variety and limitations of my environment. A common example for me are various wild varieties that tend to grow tall first, then bushy later. This can be a concern for me indoors, based either on headroom or because the intensity of many lights drops off precipitously over a short distance and, if raised to accommodate the height of the plant, the lower lateral nodes won't have satisfactorily intense light by the time they start to develop.
In your current situation, I would remove a few leaves from the crowded areas of the bushier plants. I think you're at risk of excessive humidity within the plant and should increase the air exchange. Increased humidity raises the chance of infection by many pathogens, including fungal and bacterial leaf spot, which you may (or may not) be starting to experience. I don't know if you're using a fan, but as long as it isn't set to blow on them continuously, some increased air movement might help if you're not doing it already. Oscillating fans running for 5 or 10 minutes a couple/few times a day are great for this and even a non-oscillating fan (not aimed directly at, but near the plants) will help. When you remove leaves, use care to sanitize (isopropyl alcohol is my preference) the cutting tool between plants (especially the one with the funky leaves, which I'd cut last to be safe) to avoid communication of pathogens.
My recommendation: remove the bad leaves (last in order), remove a few leaves in the denser areas - but not too many. Increase air flow if appropriate. Learn to prune by first not pruning. Use the experience of learning how different varieties behave in different circumstances and what conditions you want to prevent in the future by pruning.