Tracking depots usually check all the relevant joints before doing the measurements and warn the customer of any wear/slop. As said, only the front and rear wheel toe can be adjusted, but other parameters may also be out of spec before tracking and in spec afterwards. It's the luck of the draw. Another factor that has an effect is fatigue as distinct from wear. Rubber bushes can age enough to affect load settlement of the suspension, even though there's no detectable 'slop' in the joints. The resulting camber changes are in arcminutes (1/60 of a degree) so microscopic. If you'd not filled the tank, it may well have been in spec. This isn't something the average guy can assess. You simply renew the bushes when it gets far enough out to cause abnormal tyre wear.
TC
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