I have some questions about ASI camera drivers

[AstroAir]

Recently, I was working on the development of ASI camera, and I had some doubts after consulting indi's code on this aspect
`

long blinks = BlinkN[BLINK_COUNT].value;
if (blinks > 0)
{
    LOGF_DEBUG("Blinking %ld time(s) before exposure", blinks);

    const long blink_duration = BlinkN[BLINK_DURATION].value * 1000000.0;
    errCode = ASISetControlValue(m_camInfo->CameraID, ASI_EXPOSURE, blink_duration, ASI_FALSE);
    if (errCode != ASI_SUCCESS)
    {
        LOGF_ERROR("Failed to set blink exposure to %ldus, error %d", blink_duration, errCode);
    }
    else
    {
        do
        {
            errCode = ASIStartExposure(m_camInfo->CameraID, ASI_TRUE);
            if (errCode != ASI_SUCCESS)
            {
                LOGF_ERROR("Failed to start blink exposure, error %d", errCode);
                break;
            }

            ASI_EXPOSURE_STATUS expStatus;
            do
            {
                usleep(100000);
                errCode = ASIGetExpStatus(m_camInfo->CameraID, &expStatus);
            }
            while (errCode == ASI_SUCCESS && expStatus == ASI_EXP_WORKING);

            if (errCode != ASI_SUCCESS || expStatus != ASI_EXP_SUCCESS)
            {
                LOGF_ERROR("Blink exposure failed, error %d, status %d", errCode, expStatus);
                break;
            }
        }
        while (--blinks > 0);
    }

    if (blinks > 0)
    {
        LOGF_WARN("%ld blink exposure(s) NOT done", blinks);
    }
}

PrimaryCCD.setExposureDuration(duration);
ExposureRequest = duration;

LOGF_DEBUG("StartExposure->setexp : %.3fs", duration);
long uSecs = duration * 1000000.0;
ASISetControlValue(m_camInfo->CameraID, ASI_EXPOSURE, uSecs, ASI_FALSE);

// Try exposure for 3 times
ASI_BOOL isDark = ASI_FALSE;
if (PrimaryCCD.getFrameType() == INDI::CCDChip::DARK_FRAME)
{
    isDark = ASI_TRUE;
}
for (int i = 0; i < 3; i++)
{
    if ((errCode = ASIStartExposure(m_camInfo->CameraID, isDark)) !=
            ASI_SUCCESS)
    {
        LOGF_ERROR("ASIStartExposure error (%d)", errCode);
        // Wait 100ms before trying again
        usleep(100000);
        continue;
    }
    break;
}

`
Why do you have to repeat the exposure three times, so it won't be a problem？