In Short

Reasons for why a conlang should be easy and precise?

Subject:  In Short

In promulgating your esoteric cogitations or articulating your
superficial sentimentalities, and amicable philosophical or
psychological observations, beware of platitudinous ponderosity. Let
your conversational communications possess a compacted conciseness, a
clarified comprehensibility, a coalescent cogency, and a concatenated
consistency.

Eschew obfuscation and all conglomeration of flatulent garrulity, jejune
babblement, and asinine affectations.

Let your extemporaneous descantings and unpremeditated expatiations have
intelligibility and voracious vivacity without rodomontade or
thrasonical bombast.

Sedulously avoid all polysyllabic profundity, pompous prolificacy, and
vain vapid verbosity.

In short: "Be brief and don't use big words."