Can you give an example? In my experience that isn't really the case. For example, there are bazillions vdom implementations and they are only where they are now in terms of perf because of the intense competition.
This was also the case with jQuery/Sizzle and friends back in the day. There's js-joda/moment/date-fns, underscore/lodash/ramda/just, css modules/styled-component/styletron, etc etc etc.
Lack of competition tends to lead to stagnation, and since js has such a large (and growing) community, you're never really going to be at a situation where major libraries will run out of community support due to competition of equal caliber.
"The C language does not exist; neither does Java, C++, and C#. While a language may exist as an abstract idea, and even have a pile of paper (a standard) purporting to define it, a standard is not a compiler."
The immense fragmentation of C compilers makes it difficult to build static analyzers.
You're correct that the cost of fragmentation is seldom that there's a lack of resources around any single project. It's more that complementary products are much harder to build, because there's no standard for the product category.
This was also the case with jQuery/Sizzle and friends back in the day. There's js-joda/moment/date-fns, underscore/lodash/ramda/just, css modules/styled-component/styletron, etc etc etc.
Lack of competition tends to lead to stagnation, and since js has such a large (and growing) community, you're never really going to be at a situation where major libraries will run out of community support due to competition of equal caliber.