Why might an observer sometimes notice a writing spider's web lacking a defined stabilimentum?

If the web is frequently damaged or the spider rebuilds often

Although the spider often demonstrates consistency in recreating the stabilimentum even after relocation, the structure is not permanently guaranteed in every web. If the web sustains damage frequently—perhaps due to environmental factors or accidental contact—the spider must expend energy repeatedly to repair or reconstruct the entire snare. In situations where the web is rebuilt often, or if the structure is intentionally removed by an external factor, the necessary time or resources might not be fully allocated to rebuilding the conspicuous zigzag pattern, resulting in a less defined or entirely absent stabilimentum in that particular instance.