purist

This term describes an individual driven by a rigid commitment to authenticity or orthodoxy. It often carries a slightly pejorative undertone, suggesting a level of stubbornness or an impractical refusal to adapt to evolving standards. While it can be used with respect for someone's dedication to quality, it frequently implies a lack of flexibility in the face of modern convenience or creative innovation.

In practical usage, the word is frequently applied to niche hobbies, linguistic standards, or culinary preferences. It distinguishes a person who values the original, unadulterated state of a thing over a version that has been modified for accessibility or mass appeal.