I'm here, and I've been working with data patterns continuously from 2017 to 2026.
Subjective assessment: In the first half of 2018-2022, 14 MHz was the primary frequency used, with 21 occasionally being activated. 28 may only be used a few times per year.
In the very early stages, I mostly ignored the low-band signals because they were generally noisier than the high-band signals. It was much more enjoyable to work high-band QSOs, as everyone could hear clearly. Therefore, once the high-band became available, there was no need to use the low-band.
Additionally, as QED mentioned upstairs, according to my memory and logs, FT8 actually appeared in late 2017. However, even though everyone was calling it FT8 at that time, there was a change in the internal encoding format of FT8 in either 2018 or 2019, so that version was the first version of FT8.
Appendix: My QSO log details over the years.
Several of the black Yagi antennas are single-element Yagi antennas, and they were mounted and secured in a fixed position for several months.
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