I think the system has some great potential.
As it stands the technique is perfect for things like furniture or landscaping, where specific accuracy and symbology isnt the highest priority.
(for what it’s worth, I would describe a door in “leaf” size (the moving part of the door); the opening size is described and created via the architectural framing plan. There are something like 20+ pieces of “door” when you consider archtiraves, leaf, jambs, glazing, hinges, door furniture (knobs), etc, etc. How far do you go?
I haven’t had a recent browse through the LC library, but perhaps there is an issue where munching into the architecture cookie likely results in biting off more than one can comfortably chew.
Many users of Sketchup for archtiectural models are moving into a BIM-style modelling environment where accuracy, metadata and customisation (or, actual manufacturer-specific sliding doors) are required. In that context, the entire model works as a design & documentation system aligned to local industry practises & outputs. Components need to work in 2d plan, 3d renders, cross sections and all on specific tags and line styles according to that SU user’s setup. One of the flaws (i’ve often said) about SU is that it leaves SO much to the individual person to figure out their own workflow that it’s resulted in there not being any globally-recognised or consistent workflow or setup.
It is for this reason that so many SU architects spend a reasonable amount of time creating and managing their own component libraries (and aligned with specific extensions they may have). I havent done a formal survey of this, of course, but I do know that Revit and Archicad emply massive amounts of effort and time into developing region-specific architectural components and standards.
There is stilll a huge need in the SU world for “conceptual design” where any old slding door is fine and it just has to look reasonable. LCs are fine for that now but, from what I can gather, the tech (parametric engine) would actually be competent not only in providing conceptual modellers with a sliding door to adorn their building mass, but it could create entire buildings and libraries of typologies.
As for DCs…Whatever they offered was awesome (in theory/potential) but I have to admit I didnt even get into them in a proper way, despite there being obvious value in my sort of projects… In hindsight I should have paid a company to develop my own library of DCs. Maybe LCs are doing that work now, for free?