Are women let down by period trackers?

Some offer to track additional data including basal body temperature, sleep patterns, menstrual pain and sexual activity, which can provide further clues – although there have been concerns around .css-1xgj2ad-InlineLink:link{color:#3F3F42;}.css-1xgj2ad-InlineLink:visited{color:#696969;}.css-1xgj2ad-InlineLink:link,.css-1xgj2ad-InlineLink:visited{font-weight:700;border-bottom:1px solid #BABABA;-webkit-text-decoration:none;text-decoration:none;}.css-1xgj2ad-InlineLink:link:hover,.css-1xgj2ad-InlineLink:visited:hover,.css-1xgj2ad-InlineLink:link:focus,.css-1xgj2ad-InlineLink:visited:focus{border-bottom-color:currentcolor;border-bottom-width:2px;color:#B80000;}@supports (text-underline-offset:0.25em){.css-1xgj2ad-InlineLink:link,.css-1xgj2ad-InlineLink:visited{border-bottom:none;-webkit-text-decoration:underline #BABABA;text-decoration:underline #BABABA;-webkit-text-decoration-thickness:1px;text-decoration-thickness:1px;-webkit-text-decoration-skip-ink:none;text-decoration-skip-ink:none;text-underline-offset:0.25em;}.css-1xgj2ad-InlineLink:link:hover,.css-1xgj2ad-InlineLink:visited:hover,.css-1xgj2ad-InlineLink:link:focus,.css-1xgj2ad-InlineLink:visited:focus{-webkit-text-decoration-color:currentcolor;text-decoration-color:currentcolor;-webkit-text-decoration-thickness:2px;text-decoration-thickness:2px;color:#B80000;}}what else this data can be used for by the developers of the app.