Only ~" and narrow scope of observation
If a person A says "only X", it means that there was only X in the range of observation of person A. It is not clear whether there is really only X or whether the range of observation of person A is narrow.
https://gyazo.com/3cbc2309fd17dbbf7f67b46c7ea073f0
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This page is auto-translated from /nishio/「〜だけ」と観測範囲の狭さ. If you looks something interesting but the auto-translated English is not good enough to understand it, feel free to let me know at @nishio_en. I'm very happy to spread my thought to non-Japanese readers.