Keep it simple, stupid.
Pequenio appears to be simple in appearance. Is it really?
When forking Pequenio from Micro one of the thing I cared most about was keeping appearance while adding functionalities like pagination in articles but simplicity also improved, before the theme used only a small part of Bootstrap, a big CSS framework but it had to load it in every request if cache was misconfigured. I cared about this and did a major css rewrite so only the needed css is used making a good cache policy unneeded to have fast loading times.