My suggestion was that you save the standard sizes up front. Which means you don’t need the design software. I understand the desire to tweak sizes in the GFUI, still, its best left to design software. Depending on how you synchronize files between computers I can understand how it could be frustrating starting at the GFUI and not being able to tweak the files due to them being located remotely.
As for having the software immediately available, I’m not sure what systems you are using so I don’t know what issues you may be having there. I am being forced to boot into windows far more then I would like as Fusion 360 doesn’t run in Linux.
I used to be with you on this one, though have recently gone to the dark side, alignment should be done in design software, not the GFUI. It’s easier to align precisely, its saved locally, it’s reusable, it simplifies the layout process, it’s scalable, etc. With how freely available and easy tools like Inkscape make it importing and reusing SVG’s I no longer see a need to have it in the GFUI.
As for nesting, it’s a surprisingly simple problem to solve, its actually a typical software engineering interview question. Regardless, I don’t see it as a feature that is needed anytime soon. It can be done locally and without knowing if their implementation is deterministic it could make printing harder. On top of all that I already have a CI system set up to handle post-processes for my designs and adding them to source control.