Thick brush script is always popular, but it varies. Smooth, refined, and creamy brush script is everywhere (food labels, sports teams), but rough brush is trendy at the moment: brush lettering that appears to be hand-drawn. (See my post on eccentric hand-inked script.)
Naturally, this lends itself to irregular and eccentric letterforms. Those may communicate a childlike charm as if freely painted in watercolor; or artistic, as if using a bamboo brush, or bold, as if slapped onto a wall.
In order to simulate real brushwork, a digital font must include one or more alternate letterforms for each glyph – so the viewer notices no repetition – and ligatures (connected letters which function as alternates).
That’s the difference between a professional font like “Gloss Drop” (at the top) and others available for little or no cost, which may be well-designed but don’t include alternates and ligatures.
If I were using one of those, I’d manually alter neighboring letterforms, if necessary. That would maintain the illusion of spontaneity.