Selenium vs Testsigma for continuous testing in fast-paced Agile and DevOps

Selenium is definitely one of the early and best tools out there. But Selenium alone cannot address your continuous testing needs for fast-paced agile and DevOps practices. You need to build a customized solution that is scalable and reliable using Selenium. And, it becomes a parallel development project. Is that what you should be focusing on instead of providing a solution for your customers?