>Maybe 5-10 years ago, there is no need anymore
Is still either create your own or install a random package that brings other 20 as dependencies.
Example, you want to show an Alert or Yes/No popup, This are built-in everywhere but n Web world you need to review and install a third party thing, or create your own buggy or incomplete implementation.
Maybe you want modal dialogs, this is a standard in GUI tookits but you need to create your own or install a package/module/plugin specific for your project shitty framework
Maybe your designer demands a (context) menu one with keyboard shortucts and native looking like , or a scrollbar that matches the website/app theme colors or that works horizontally without holding Shift like in native apps, you have again to find 1 solution from a giant pile of shitty packages.
The dropdows,scrollbars, number spinner, color picker inputs CSS customization is pathetic, the designers demand customization and the only solution is installing third party stuff.
There is no DataGrid or ListView component with a smart implementation that can hold many items so all websites implement a crappy inefficient thing, or show you only 20 items and you need to hit NExt Page like a money or again you find a third party solution.
As a language JS progressed a lot, so much I am not sure if switching to TS is a good idea or I just need to wait until JS will catch up with TS. But as a platform the Web /DOM is still garbage, CSS got some nice feature with flexbox but that is all.
People that did not wrote complex desktop apps with a GUI framework will not understand this, and think that the shitty component they create by nesting 12 divs and catching 2 events is the exact same thing. It is not, this GUI frameworks components are efficient and handle all events/cases properly. Even Google devs were incapable to make the Youtube search suggestion dropdown work correctly, many times it gets stuck open and you can't close it without a reload.