Reshape Tool is a rather hidden tool within Illustrator’s toolbox.
It never received any updates (as many other tools) in last decades, and got even worse thanks to one specific improvement.

Illustrator today allows to increase size of anchor points, handle, and other control markers (referred below as just 'markers') with a dedicated parameter in the Preferences > Selection & Anchor Display section). It helps to transform and edit paths on higher DPI displays — a good feature.

...but Reshape Tool marks its control points with squares slightly larger than a normal point... a normal point of a smallest marker’s size, and this size does not change when we increase the mentioned parameter.

It makes the Reshape’s control points to be obscured completely when we use larger sizes for markers.
It makes it unusable for users who does not know how the tool works.

And Adobe does not make learning it anywhere simple: try to search for 'Reshape Tool' at https://helpx.adobe.com/illustrator/ and fail miserably to locate it fast enough.
Try Discover (rather useless) and get only the position of the tool and no how-to articles.

Here are a link to the dedicated article: https://helpx.adobe.com/illustrator/using/adjust-path-segments.html#stretch-parts-of-a-path (it fails to load at me now though)

Here is a another link, form a Ai10 manual, with an image that somewhat explains the tool: https://www.manualslib.com/manual/393317/Adobe-Illustrator-10.html?page=9#manual

Finally, take a look at the attached GIF.
The frame around a clicked point with the Reshape tool is visible as the smallest marker’s size... and when I make the size larger, clicking a point with the tool just doesn’t change anything visually! The frame is completely obscured! The tool works, but new users will hardly understand how to make it work.

Please fix it.