@JuniperMasterRace
You mistake is "Correcting Someone Who is Wrong on the Internet". Majority of people typing "on the internet" just want to be noticed. They are not interested in what anyone else hasc to say. Or they are looking for the "fight", the back and forth.
"Just back away from the keyboard". and let the fools make fools of themselves.
On the specific topic. One can apply bonsai techniques to just about any plant. But that does not make the plant bonsai. There is nothing wrong with attractively grown specimen plants, but generally only trees and shrub species that make "true wood" can really become bonsai. Some exceptions are allowed for woody herbs.
There is the sub-category of bonsai called kusamono, which are usually considered accent plants. Kusamono is the generic term for accent plants. The original meaning of the term kusamono is grass planting. Very often kusamono are mixed plantings of flowering herb, fruiting plants and grasses. The best kusamono are almost always mixed plantings with 3 or more species in the pot. Single species plantings are commonly used but are not as highly prized. Kusamono is the more general term used for a wide variety of accent plants.
Shitakusa are specifically accent plants to be displayed with bonsai. There are a number of loose rules for shitakusa. The shitakusa should not be taller than the stand of the bonsai the shitakusa accompanies. It should set the place, for example, forest or field, for the bonsai, and the shitakusa should indicate the time of year, winter autumn, spring or summer. The direction of movement or flow of the kusamono should be paired to the bonsai.
Second category for Kusamono is Sanyasou. Here the planting is the focal point of the display. This is where an attractively grown "non-tree" species can be displayed. Key is the artistic display. All the "rules" of bonsai apply, the plant or planting should provide a sense of place and of season. For example, there is a famous photo of a Rhus (Toxicodendron) succedaneum, Japanese sumac. It looks similar to the North American staghorn sumac. Lovely autumn colors. A single simple trunk, with zero branching. When you see photos it is difficult to judge the scale. Then the photo of Kimura with the plant, and the tree is as tall or taller than Kimura. Here is a non-traditional plant, that occasionally gets displayed on its own, as a focal point of a display. It is only shown in full autumn color. It sets place and time of year. It is a classic Sanyasou.
So in summary, if it is not a tree species or a woody shrub, it is unlikely it will be considered bonsai. But attractively grown plants, houseplants herbs and grasses can be grown to be attractive and enjoyed in their own right. Some may actually be considered Kusamono. But like bonsai, kusamono is difficult to define. Most houseplants, succulents and marijuana plants will never be considered kusamono any more than they will be considered bonsai, but by remembering the category kusamono exists, some of these "houseplants" to make the cut. Not all, but some.