People make the civil engineering comparison all the time, but is software development really that much less standardized?
What's standard in building a bridge? You have some physical constraints(length, what's the bridge crossing), material properties, environmental constraints(temperature, weather, wind, what soil are you building on), what kind of traffic. Then there are standard 'shapes'(though it's your choice of suspension or whatever). You then have a ton of standard tests that you run to check that the bridge is fit for purpose. But it's not like the bridge is built out of legos, and even if a lot of standard subcomponents are used the assembly will still end up being fairly unique due to every location being different.
Software does in fact have tons of standardization. No one thinks of processor arch when doing web dev. Or DB implementation. Or how you modify the dom(there are a handful of libraries to choose from, similar to a handful of bridge designs).
How do you make a CRUD app? You can do some arthouse project, or you can just use Rails or various Rails-like frameworks. They're all mostly equivalent.
How do you serialize data? JSON(before that XML, I guess). Yes, you can do something different, but you can also build an apartment building out of reclaimed wood.
The real uncertainty lies at the User Interface, which really isn't engineering driven, it's fashion and art and stylistic architecture. So yes, the way websites look tends to change and be fuzzy, but so do clothes and no one complains about that.
I think software people both overestimate the standardization of physical engineering and underestimate the complexity of physical engineers' decisions, presumably they're not just following a recipe.
TLDR: When software standardizes a tool or process it becomes invisible, an import and forget somewhere in the pipeline of tools we use. This makes it seem like there's a lot of churn. But the churn is a bit of froth on the top of really solid foundations. Yes we're always working in the churning part, but that's because the foundational part requires almost no interaction at all.