But that means unless you want a bigger car you have to tend to drop a model level, admittedly the NX is hardly a major drop but the RX is still a step above in refinement, performance etc.
It will be like in another generation the IS being the same size as the old GS.
Just don't understand why pretty much all manufacturers (this isn't Lexus specific) keep on making every generation bigger - roads, car park spaces, garages etc. do not get made larger every few years so each generation struggles more and more with space (Obviously more in some countries than others)
Well strictly on the point of Lexus and Toyota, if you historically look at all of their major models, they haven't changed a great deal size-wise. Some small size increases have occurred yes, but not dramatic size increases. There are a variety of very complex factors and reasons that go into why a model from generation to generation may slightly increase in size. It could be factors such as owners asking for slight size increases in certain areas, it could be slight body increases due to meeting new or changing safety and crash regulations, it could be required size increases for added technology or features, it could be due to the aim of a specific model changing slightly, and the list goes on and on.
You brought up a very major point; depending on where you live, things can be different. Roads, parking spaces, and garages often differ in size and dimensions depending on what country you live in. Not every model from every automaker is sold in every country. Often there are special regional models an automaker sells only in certain countries. In other cases, with major models like the Corolla, there are slight body variances and body size variants between different Corollas sold in different regions.
Even with Lexus, regional differences can exist. For example the European NX gets a very slightly different front end than North American NX models.
So say if we're talking about a 1IS or 1RX... I'm quite certain that any parking space or garage that those fit in comfortably, you can also fit a 3IS or a 4RX. The key word here being fit comfortably. If you were able to squeeze a 1IS or say 1RX into a parking spot or garage, but it was extremely tight, then I would say those spots were too small for the vehicle to begin with.