>Wizardry is all about disillusionment and abandonment subjectivity in favor of the truth. I'd say that tulpas in their purest form, where you sincerely believe in their existence as autonomous entities, are much more normie than they are mage-like.
The problem is that the distinction between subjective and objective reality is so blurred due to us only being able to experience the universe through senses (observation), metaphorical maps (theory) and imagined input-output systems (mathematics), that pursuing truth objectively is difficult. It seems to work best only on the most superficial level, when we agree to deal with physical phenomena (e.g. drinking mercury), share identical observation methods and agree to judge our conclusions based on their predictive power. Dig a little deeper and you have uncertainty, multiple working models, non-observable but mathematically sound objects, etc.
Confirming that drinking mercury will kill you as a reasonably objective fact is easy enough, if we don't get into absurdities. It is erroneous to assume, however, that because we can state what seems to be an objective truth about drinking mercury, we can do the same with everything else in the universe, and when we can't it's because those things don't fall into our neatly defined Truth set and are therefore falsehoods, spooks and dragons.
Consider a phenomenon that is a lot more difficult to understand objectively (than the consequences of drinking mercury) - the Self. It has a physical component (detectable signals), but that's hardly all it is. You can make some reasonably good predictions based on observing my behavior and creating a model of my Self, and I can make some reasonably good predictions about my own behavior, based on my own Self-model. And of course our models are going to be very different, and derived by different means.
The self is real but also fluid, subjective and personal.
Tulpas are an attempt at creating a secondary agent that's similar to the Self. In theory it should be possible. In theory it can be beneficial. Calling it unwizardly, based on some nebulous criterion that no one can hope to fulfill is a mistake. And if you're dismissing tulpas as objectively false (i.e. they're unreal, only in your head, stop being crazy!), then you must apply the same standard to your own Self, otherwise it's inconsistent and not a standard at all.
People discuss ego death here frequently. Perhaps there are other things one can do with the ego, besides killing it? It's worth discussing.