There are a few things in play.
One: Technology greatly advanced from 1990 to today. Back in the 1970s, models were hand made, over scale, then broken down into parts and rendered into a scale model mold using a panograph. The process depended on master model makers, was very time consuming, and cutting molds was expensive.
My the 2000s, models designed on a computer using Computer Assisted Design and Computer Assisted Manufacturing (CAD/CAM) were becoming common. (Around 1997, I made my first 3D drawings and rendered them using free software.)
During the 2010s, 3D printers become cheap enough for anyone to own. Dozens of free or very cheap CAD programs existed. Schools were now teaching CAD to kids. (The first 3D printed product design I was personally involved with was in 2002.)
Today, anyone can design and 3D print a model using free software and cheap machinery. Software exists to break a 3D model apart, render it as part trees for injection molding, and test the layout for proper injection. Automated machinery to cut molds is readily available and relatively cheap. Automated machinery to injection mold is readily available and relatively cheap. You can take files to lots of companies and have them manufacture parts by the 1000s for pennies a tree.
Everything I just described happened for figure modeling. Programs exists to create human figures in seconds, then allow complete control of every detail. Libraries of faces and clothing exist. Once you know where to get the drawing files for cheap or free, it is possible to crank out figures in whatever poser you like, then 3D print them of have them turned into injection molds.
Two: There are a lot more people with the know how to do these things today than 50 years ago. In 2026, you can learn the entire work flow to manufacture almost anything by watching a bunch of videos on YouTube. You can get better quality courses through a number of instructional streaming services.
Three: People make what they want to make. In other words, if some guy who loves Motor Torpedo Boats decides to learn how to manufacture stuff and has a knack for it, pretty soon, we are going to see a bunch of Motor Torpedo Boats for sale.
Four: 3D file repositories are now massive, growing all the time, and most of it is free or very cheap.
Five: Computer programmers are now writing software that puts all the pieces together, reaches out to the 3D file repositories automatically, and puts everything together for the user, drastically reducing required know how further still. Dum dums who claim to be reporters call this the AI Revolution. Nope. It is all part of a slow march that started before I was born. The necessary pieces reached fruition for the next phase of automation to progress. It was inevitable and quite pedestrian in development.
Put that all together and making stuff is easier than ever and getting easier all the time. The next big push will involve computers and machines painting everything for us. The Golden Age of model building will end. We will be one of the last generations of model builders who actually knew how to build and paint a model.