What's an RLET?

[emptysea]

I would argue that a farkle is a non-essential addition to a motorcycle. A farkle may or may not be functional, but it is never necessary. So, are RLETs "necessary". One may be able to operate a Cb1100 without RLETs and may even think they are happy, but have they maximized their happiness? Is it necessary to maximize one's happiness on the CB? If it is, then is it not necessary to add something to the bike that maximizes that happiness? So, wouldn't it be necessary to add RLETs? If they are necessary aren't they something different than farkles?
BTW, my philosophical waxings may or may not be influenced by the two gibsons I have consumed this evening.