Ability to place section planes to cut a model

Currently, if you want to cut a section through a model, Blender offers the Alt-B feature, otherwise known as the View Region->Clipping Region feature.

This type of sectioning feature is extremely important for architectural modeling, and is used heavily in other applications in the CAD and AEC industry. The example screenshot shows SketchUp's section plane feature. Without this feature, Blender cannot be used to interrogate complex architectural, engineering, and construction models.

I propose for Blender to have a similar section plane feature, perhaps based on the Alt-B trick, but with the following improvements:

1. Alt-B currently can only be applied by drawing a bounding box in the current view. Instead, it would be better to create an infinite plane object, similar to the orange plane in the screenshot above, which can be moved/rotated/snapped like a regular object to precisely place it where a section needs to be made.
2. Alt-B currently only makes one section cut. I propose the ability to create multiple section planes that can act together. For example, when dealing with a model of a multiple building, you often want to cut a section in many directions, sometimes known as a "section box" in other software.
3. It would be good to be able to retain the section plane objects and toggle them on and off. The disadvantage of Alt-B is that after you clear it, it may be hard to recreate the exact same section.
4. (Nice to have) there should be a thicker line, perhaps with another colour, that delineates the cut model, similar to the thick black line in the SketchUp screenshot above.
5. (Nice to have) it would be cool if it could somehow affect only a subset of objects / collections - so that some things are cut and some aren't, but I understand if this is prohibitively complex.
6. (Nice to have) it would be cool if this could be rendered too - a proper render, not just Viewport Render Image but I understand if this is prohibitively complex.

Therefore, I propose in the Shift-A menu, a new object be called "Section plane". This creates a plane object, with its normal showing so you can see the direction in which it acts. In its object / data properties panel, there is a simple boolean checkbox saying "enable" or "disable".

To clarify, this feature proposal cannot be achieved using camera clipping planes, as they only work parallel to the camera view. It also cannot be achieved using booleans, as there may be thousands of complex objects in an architectural model. It also cannot be achieved using material shader tricks, since that only works during render-time, so is too slow - it may be faster with Eevee, but Eevee seems to lack a scene material override out of the box, so it is not easy to implement.

To clarify again that this is not the same as boolean:

Booleans apply to a mesh, which means that is impractical if there are 10k or more objects in the model (very common in architectural models), as it:

1. has to be applied to all objects in bulk
2. is very slow to compute, compared to an OpenGL solution
3. does not act infinitely
4. does not work on curve objects, or cull the viewing of non-mesh objects like lights
5. with the current boolean implementation, also isn't quite stable depending the mesh topology.
6. cannot be easily applied to linked models - which is also very common in architectural datasets, where architectural, mechanical, electrical etc are all separate models that get linked.

In comparison, Alt-B, which works through OpenGL, is instantaneous even on the largest of models.