You don’t need Fitt’s law for what you’re saying. It’s obvious that small objects are difficult to aim for. This is the main thing I dislike about HCI/UX: More often than not people have to unnecessarily refer to laws or norms to sell their observations.
The only non-obvious insights Fitt’s law bring are that objects twice as big and twice as far away take the same time to aim for, and that as objects become smaller or distance increases the time only grows logarithmically. Everything else is just squeezed into its definition to make it sound well-founded.
The only non-obvious insights Fitt’s law bring are that objects twice as big and twice as far away take the same time to aim for, and that as objects become smaller or distance increases the time only grows logarithmically. Everything else is just squeezed into its definition to make it sound well-founded.