[gamblor956]

Tesla has to account for legacy systems and designs, since they refresh models all the time without even bothering with distinct ("set in stone") model identifiers (like year). For example, there is no such thing as a "2018 Model 3" as there were multiple variants released over the year with changes over the year, not including the range-based option packages.

In fact, Tesla's legacy systems are actually a disadvantage perspective, since they have to account for a much larger range of hardware configurations than do legacy automakers.