I manage flying without thinking about any computer equations.
I know the FBW, (and auto-thrust* and GS Mini), are there. I know what they do and how they help me, and I know how to operate the side-stick without creating PIOs. Then I just fly the 'plane by feel, observation and experience, and it all works very well.
*older A330 auto-thrust can be 'lazy' near the ground in certain conditions but you simply deal with it.