Anyway, personal anecdote: I know a guy who was a Java programmer for almost a decade, in a Java-heavy corporate environment. The company's been also investing in frontend for a while. Being bored with Java development, he learnt JS, and started following angularjs (stackoverflow, github issues etc.) in his spare time (a bit in the morning, a bit in the evening, just regularly), and within a year, with the support of a senior manager, basically became a "free-electron" angular evangelist inside the company.
The transition was pretty fluent, now he works on angular-related stuff full-time.
This is one reason why people 40+ with kids tend to migrate into management. Their technical skills are getting rusty and having kids decimates your ability to take on major tinkering projects that help you learn new skills. However, their people skills are evergreen and even sharpened by their experience as parents.
Software developers don't have such protection and any mention of such a thing will get you blackballed within the industry by employers and ostracized by peers as most have bought in to the narrative that cooperating is bad for the individual.
However, my SO is a physician and they spend A LOT of time on skill mastery beyond med school and residency, however, their keeper is their profession, not their employer which is a major difference.
Regarding the OP's question: new hip languages and frameworks evolve way faster than human body, and "it works" is more important in medicine than "iterate and fail fast" (hopefully:)
My personal theory is also that partially the high expectations are due to open source / hacker ethos (there's generally no medical open source movement, or in any profession outside of IT AFAIK, at least on such scale). The cycle goes like this:
- some folks want to do something cool for fun and/or to get some fame for showing it to the public, or get famous for inventing a known lib/framework
- companies see they're smart and hire them
- other companies follow the trend, and require open source contributions or at least building space shuttle over the weekend
- a number of devs don't want to lag behind, so they join the bandwagon, and they create even more cool stuff and even more open source MVC frameworks
- now, the cycle reinforces itself, everyone is doing cool stuff and contributing to opensource, if you don't, you're excluded
edit: fixed typos
In each of these fields, the visible achievement isn't exactly the same as great performance in the field. You can get unlucky in scientific research and end up with nothing publishable; you can cook mediocre food but market it really well; or you can create the latest trendy build system instead of just mastering Gnu Make.
The misleading thing may be the assumption that most successful open source software projects are done by unpaid hackers on their own time. Perhaps that used to be the case, but many of the hot open source projects in recent history -- from Rails to Docker to React to Swift -- are built on the clock by successful programmers employed at big and small companies. But software is unusual in that serious contributions can be made by people without any institutional support.
I spend a lot of time outside my job on skill mastery as well. I do not do it in ways or domains that translate into pretty Github portfolios.
I'd say that top achievers in the software industry can also command similar benefits, but the mechanism is different. Instead of leveraging a credential into research and leveraging cool research stories into grant funding, software people get to do what they want by leveraging hard work, luck, and great stories about what they can do into great jobs or investor dollars. There are pros and cons to each system, but one big virtue of the less structured software world is that it tends to respond to market opportunity a lot more efficiently than something like medicine.
So if you are in medicine, you are required to at least go through the motions of keeping up on things.