Talking about your own lived experience or the experience of other trans people? Amazing! Encouraging a specific person, unprompted, to question their gender? Fundamentally not a good idea.

The whole problem is your assumption that unsolicited advice is a good idea. It rarely is. When genuinely trying to help people, it’s more useful be clear that you’re talking about your own perspective and your own situation. This will be much better received, and it will not make normative assumptions about how others ought to act. Saying what people should do is the real problem with egging. It unnecessarily orders people to think about their gender rather than giving them the tools to do it themselves. If they are an egg, they’ll use those tools when they’re ready.