Are budget Amazon tripods like K&F Concept and VICTIV actually usable?

Specialist photography subreddits agree budget tripods from K&F Concept, VICTIV, and similar brands are perfectly serviceable within their limits, less rigid, less durable, and less smooth than $300+ options, but functional for casual and travel use. The consensus caveat is to avoid full extension in wind and not to mount your heaviest lens on them.