Penetration tests are not just basic these are advanced techniques that have involvement in advanced tools and environments with the purpose to conduct good tests. Keep in mind that Termux is not a penetration testing platform but is software that is used to bring basic tools which are found in the Debian environment.
It has similarities with ANDRAX in terms of development and also shares many libs and GNU or Linux resources. If we talk about Termux then it is not our enemy it is only an application that allows installation of many Linux packages with help of the Debian environment running on the Android device natively.