Agree, getting too dry will cause older leaves to be lost prematurely (before the stem lignifies.) A pot this size should be easy to moisture-gauge by picking it up, and unglazed clay turns that lighter color when it has dried. There's no benefit in letting it go past the point of dryness, or even total dryness, in the porous, breathable clay pot.
Various species are called mother-of. Yours looks like K./B. laetivirens, specifically.
Mother of Millions (Kalanchoe laetivirens)
If you do decide to trim in the future, stick the top in the pot, or another pot. It will take root and continue growing as if nothing had happened, even if blooming @ the time. The more tips you have @ the time that blooming starts, the more blooms you can have.