If I'm right the water prevents the blood from clotting, also the flow is more even? And I imagine if you lose consciousness, you're also drowning in addition?
If I also remember right, they're most likely showing methods with a low success rate, if anyone's trying to attempt based on that.
At least that's what I heard in terms of dosage of medications.
But these are only assumptions, ofc.
And another thought on that is, in media, the bath tub just looks kinda dramatic?
Partial hanging in the wardrobe just wouldn't be the same vibe.
And if I did it in the bath tub; one of my reasons would be to combine methods (blood loss, overdosing, drowning) and to feel "at home" and "safe". I could try to make it as comfy as possible; using my favourite scents, listen to music.
And if someone else is in the house and you're usually taking long baths, it wouldn't be that suspicious if you lock yourself into the bathroom when you're committing.
Still not my preferred location tho, I don't need to be found by family members. Still alive? Chance of being left as a vegetable. Dead? Traumatising them.
Doesn't sound appealing overall.