Primary and rechargeable batteries, at reasonable cost, which are guaranteed (and really) never leak.
Electrolytic Capacitors (i.e. low cost, relatively high capacitance value) which DON'T leak and/or significantly deteriorate, over a large number of years.
Ammo roll component strips/reels, which can peel apart by hand, and leave NO residue (similar to post it notes adhesive, or compressed paper friction holding them WITHOUT glue). Which saves having to cut them out (but hence shorter leads), to avoid dealing with sticky residues, or use components NOT in strips (i.e. boxed loose).
More distinctive/standardized ways of indicating polarity on LEDs.
UV ink printing on smaller surface mount components, so more information (such as values, type etc) can be gleamed from them (with a UV torch or similar) when repairing/inspecting, hand prototyping etc.
Linear voltage regulators designed and guaranteed to almost always fail open circuit, at regular prices.
Put in some kind of anti-fake technology, so that fake components can readily be identified, and rejected/replaced.
E.g. Holograms, encrypted info built into chips, security numbers, micro-dot technology, etc etc.
Something really cheap, easy (and low cost) to check for fakes and yet highly difficult/expensive to defeat.
Include manufactured date (via the encryption/hologram etc, as labels could be over-written), so that reused/used components (from scrapped goods) can also be detected.