Geometry vs 3D modeling software

Before you say anything im 100% sure that the software would be better if you wanna make something more complicated but for something that isn’t that precise the geometry tool is good.
When i first asked about what it was and if i should use it instead of meshes people said it takes a lot of memory and that normal basic mesh is better but i wanted to make a desk and with the basic mesh it took so long and when i tried the geometry tool it was done in way less time and more precise and if its all about the memory i have heard that after you’re done you can just convert them to basic mesh.
I know i sound in love with it but i wanna just know if its good to use for basic modeling for example a chair or a door or a lamp.
Thank you

Generally speaking BSP geometry should no be used for anything which gets rendered, only invisible stuff like volumes or colliders. Their other main use is rapid prototyping, to quickly play with dimensions, level layout and so on, early in the development (grayboxing). But if you want to be even half serious about creating art assets then you will have to learn an actual 3d modeling software. Fortunately there are a lot of them around. Blender 2.80 (still in beta but already usable) for example is free, has a vibrant community and a swath of learning resources.

what i wanna know exactly is why not use it? because i made furniture with it and switched it to mesh and there a game object with good performance so why exactly is it bad or not used for modeling basic stuff?
sorry for getting confused with your answer and thanks

i tried blender and it wasn’t easy but if its worth it then ill give it a tutorial try.
Thank you for explaining it

It might be fast for making super simple shapes but way, waaay too slow for anything beyond that. If you like the quality of meshes you produce with it then yes, convert them to static meshes and use them, you’ll be fine. Just keep in mind that since the tool was not meant to for creating art assets it will tie your hands and severely limit what you can achieve artistically.