Dimension is pretty much a dead product, kept alive for now by Windows users who invested heavily in the GPUs it uses.
Take a look at the apparent replacement, Substance: you can get a free trial.
If your use of these types of products is not determined by commercial file format requirements, take a look at Blender, as at least the price is right.
On the subject of Macs for other applications - our designers were using iMac Pros for their work prior to Covid, convinced they were "power users", but found that the close to entry level MacBooks they also had were more than good enough for anything they touched short of 4K video. With Apple Silicon, they are now happy again with M3 devices, the earlier ones were limited unless you spent a lot of money) but I'd venture that the new Mac Mini is up to most of it in standard configuration. Paging is so fast with these devices that you don't notice a RAM upgraded M3 Macbook Pro with Photoshop or Illustrator, even.
With performance, know your bottleneck. Too many people spend a fortune on the wrong componentry and still end up with slow results.
Sure, additional RAM/SSD space is expensive, but if someone is paying you to work it's still cheaper than your time.
Having said that... if you have invested time in Windows workflows and OS knowledge (can be as simple as keyboard shortcuts!) and peripherals, it's not worth switching and having to learn the other ways of working.