What person does a back of the envelope calculation and manages to equate 75kg of metabolic tissue consuming around about 0.8kg of oxygen a day is going to be cancelled out by a couple plants draped around the place?
Planting more plants is at least a step in the right direction. Everything else is more or less simply turning it into someone else's problem.
You're right that the practical consideration is important. It needs to be addressed and engineered to be made practical.
On top of that maybe we eat too much, but that's a off topic.