True. Ego death can probably occur with any psychedelic compound.
With most substances however it is a matter of dosage. Eating 8 grams of Cubensis might get you there. The dosages that e.g. the MAPS program works with will not (yes people have different responses, but that is why you start low and they have professionals attending).
Going for a true Bufo experience automatically puts you in the realm of possible ego death. I have never heard of anyone trying to micro dose it. There are so many other substances that are easier to low dose that are more readily available too.
While psilocybin is a potent and valuable medicine, it's effects in terms of ego death are truly dwarfed by 5-MeO-DMT. Within 2 minutes of smoking bufo it's as if every fragment of your being has been evenly distributed across the entire universe, time is infinite you have zero awareness, you are simply one with all. And then the re-assembly begins.
They work very differently. Each has its own vibration / frequency. The increased dosage might increase amplitude (or intensity) of the experience, but not that vibration / frequency. I don't know how else to describe it. We need more bards like Terence McKenna.
this is also used by many about psilocybin (Micheal Pollan articles use that terminology)