> The problem is that meaning is undefined and this leads you down a rabbit hole of trying to figure out what is the meaning of life, which will make you very disappointed and lead to constructing a psychological bubble of "beliefs" that you appoint as facts to find a way out of this burdensome brooding.

To be honest, this reads to me like "I haven't found meaning in life, therefore people who say they have are lying to themselves." You're free to believe what you want, and if that's what makes you happy more power to you, but don't assume your experience is universal. I assure you it isn't.