Every analysis tool is like a Chess move you can master. The "best tools" are the ones you know how to use. Once the theory is solid, shortcut tools can be trusted. Designs start with awareness of requirements and how to convert them into functional specs,. These need no design implementation at first, Just specs for inputs and outputs , environmental stress factors , cost, time and go to it. Researching prior methods comes quickly when you can recognize what works, needs changes and then improve to exceed requirements.
Analog defines the world of all activity between a one and a zero, the latency, transmission line effects, and all physical effects of insulators, conductors, static charges, DC power, AC transmission, RF communication, Medical sensors. Then you can add smarts with digital processing power, sensors based on physics, Systems on a Chip and create better tools.
Commodity products will end up in China or India, but there is a huge world of advanced technology emerging in many fields, from more efficient electric transport , more advanced medical imaging of live cancer cells, safer smart grid technology, more sophisticated communication devices, smart detectors for predicting earthquakes, Carrington Effects, measuring condition based monitoring to prevent transformer arc failures ..from 10kV to 1.5 gigavolt.
Each of these requires the foundations of experiment and Physics discovered by Faraday, Ampere, Gauss, Weber, Ohm, Siemens, and Maxwell. From there you can either go into, Research, Applied Research, (design), Test Engineering, Software Development, System Design, or become a Business Developer, raise millions and build teams form a company to do the same. ( as many of my colleagues did.. BNR, Symbol, ImRIS, Cubresa, ... )