I have not yet used Selenium within the last 12 months; I just completed some POCs, but not actually used it.
There are many other tools that we are working on aside from Selenium.
We use TestIM, Katalon, and those are all UI function tools, and in terms of API, we are working on Postman and Ready API.
Personally, I have been using Postman for seven or eight years plus.
Postman is the easiest tool I know, there's no challenge at all. In fact, most of the Postman testing that we do is all locally, but when I say deployment, that deployment is for cloud, and whenever we want to run it in CI/CD, it's all on Azure and AWS, so it's one of the easiest things.
Postman doesn't require much time to deploy, just a few minutes or so. This applies to almost all the tools that we're working on; Selenium is one of the most mature automation framework tools we have, so there's no issue with that.
I don't find anything difficult based on my experience, but the organization of collection, running, and assertions in the last few years have been really good for me; the environment is managed well.
Postman is one of the easiest tools; I have not seen anybody complaining because it's just one Google search away.
It's easy to navigate because tons of documentation and examples are available.
It has helped significantly since it is easy; the development team and QA team all use it, enabling us to automate almost 70% of our APIs using Postman.