If you let customers pick and choose options "a la carte" to create their "custom" vehicle, then you open the door to add hundreds (maybe thousands) of added custom configurations to that list. That slows down production because even if it's available options, the configuration is bespoke.
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Also: just because they are "capable" of doing it with what is already available to them in the factory, that doesn't at all mean that they are obligated to offer it to customers as an available option from the factory floor. Everytime I bought a new vehicle, I would have loved to be able to choose each and every option I really wanted a la carte.
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And funny you mentioned Ford... whenever I did some window shopping for a Ford, their available models and options and packages are always super confusing LOL
It's already like that for Ford. I forgot the specific number but I read in some media documentation that there are well over one million possible combinations for a Ford F-150 when you consider all of the available options. Cab, bed, drive type, engine, rear axle ratio, paint color, interior color, trim, grill choice, wheel choice, etc etc.
And yes, Nissan is free to do what they want. I appreciate how Nissan and Honda prepackage their options for the most part. If you want a feature, you generally need to get the trim that has that feature. Makes shopping for a car a lot easier when you can just check off "SV" or "LX" or whatever.
And yes, Ford's million-possible-combination trims get pretty confusing. Opposite of what I just said about Nissan and Honda, it's a bit tedious to find a specific combination, even new. Want an F-150 XLT? Okay, there's an XLT 300A (base), XLT 301A (mid), and XLT 302A (luxury). Within each trim, there are at least a dozen stand-alone options such as tow package (which is different than just the hitch!), the Extended Range fuel tank, and electronic locking rear axle.
There are so many combinations that there's a lot of overlap between trims. An F-150 XLT 302A (luxury) is basically an F-150 Lariat 400A (base), but without leather seats or ControlTrac 4WD. An F-150 King Ranch 500A (base) is basically an F-150 Lariat 401A (luxury, no mids on Lariat) with all of the options checked off.
I just bought a 2016 Crew Cab SV with all the extras and while the bed is shorter, it drives about the same as the 2010 (same wheelbase) but has usable rear seating that even I can sit in.
I rarely have passengers at all and I got a crew cab. It seems like the crew cab is the defacto extended cab and the extended cab is the defacto regular cab. I was thinking about getting a 3/4 ton truck to carry a slide-in truck camper. Slide-ins don't have much storage space compared to other RVs, so I'd want an extended cab for extra storage. But extended cabs are pretty rare, so I was soon down the wormhole of looking at really old or really expensive crew cab short bed trucks.
Out of curiosity, and I know this is a total shot-in-the-dark, but did you have a MazdaSpeed3? You write similar to how a dude with the same name wrote on the Mazda forums, and you also have the same name.