Why did contemporaries criticize JB Lamarck’s theory?

Lamarck mistakenly believed that environmental change always brings about beneficial changes in organisms. In addition, he could not explain where the “striving for progress” arises in organisms, and why the hereditary property of organisms should be considered expedient to respond to external influences.

One of the components of a person's success in our time is receiving modern high-quality education, mastering the knowledge, skills and abilities necessary for life in society. A person today needs to study almost all his life, mastering everything new and new, acquiring the necessary professional qualities.