This doesn't necessarily apply to an entire product, could be a separate feature or even pieces of features.
With great product comes great boredom
Then again, it's a close one. I'd say also one of the following may take it:
How the site/app/program always seems to fall apart whenever the boss looks at it, or how the developers struggle to replicate said issues when testing it later.
How in web development, every browser seems to have its own half assed idea about which features to implement and how to implement them, rather than just sticking to the damn spec and keeping it consistent with other browsers.
The flavour of the week stuff, with developers constantly wanting to use the latest shiny framework.
Or perhaps how many designers seem to act like they're making a painting rather than an application, with zero thought put into how it scales between sizes, how things may fit in a grid, how various conditions (like errors) work etc.
From a biz standpoint it makes sense to use what's well known, time-tested, stack-overflow answered, and easy to hire for.
From a developer's perspective, it's older, boring, and less effective than newer ones. Probably much less so in front-end as there seems to be much more rapid adoption.
The best case scenario would be solving a problem in-house then open-sourcing it.