Are cheap monitor arms safe for a 49" ultrawide or OLED?

Reviewers are split. The WALI heavy-duty and HUANUO TitanLift get broadly positive reports on r/ultrawidemasterrace for 49" screens within the rated weight, but a widely-shared r/ultrawidemasterrace thread documented a VIVO heavy-duty arm failing under a Neo G9 over time. For expensive OLED ultrawides, many specialist-community commenters recommend Ergotron's HX or a heavy-duty arm well above the screen's rated weight.