Every day new themes and plugins are created. Some of them are good, some are not. It is difficult to determine the quality of the product immediately.
People tend to get used to something and not go out of this comfort zone. Suppose you are a developer and create sites for your clients. You chose a single theme and a single plugin, and use these tools in 99% of your projects. This is of course good, since you will know all the features of the chosen themes and plugins, and do the work as quickly as possible. But I would advise at this time to monitor trends and new products. Here are the specific reasons:
1) Perhaps there are already plugins or themes that can replace yours, with which you can do work even faster than before. Hence take more projects and make more money.
2) Perhaps there are already tools that can complement yours. You just may not know about some effective tools.
3) If you do not grow, then you degrade. Standing still is the easy way. All the same, you slowly remain behind your competitors, and perhaps your tools will cease to support soon, and then it will be difficult for you to restructure yourself. Therefore, grow up and get used to new things in advance to make it easier to work.
Now you know why it is important to follow the trends of WordPress.