Yes, etiolation is generally considered bad for plants, including cacti. Etiolated plants have weak, elongated stems that are more prone to bending or breaking. Additionally, they often exhibit pale or yellowish coloration and reduced spines. Etiolation can affect the overall health and appearance of cacti, making them less resilient and potentially susceptible to other issues such as pests and diseases. It is essential to address etiolation promptly to ensure the long-term health and vitality of the plant.