For what it’s worth, my “My Feed” is also missing from my home menu as of 7/17 - I have the Streaming Stick+. On 7/16 it was still there, however BOTH “My Feed” and “2020 Tokyo Olympics” lines were there, so I don’t think the Olympics actually replaced My Feed. Whether the two are related, I have no idea, but both options were listed for me, briefly. Must be a glitch, and I hope they fix it.
Its most often the case that when Roku implements temporary UI changes (menus/themes/wallpapers/screensavers) for promotional/ad/"seasonal"/holiday purposes, that a pre-existing item/element is replaced by the temporary item/element (device memory/coding efficiency considerations).
On all my different models, this is the case with "My Feed" and "Tokyo Olympics 2020".
Preferably they could co-exist, with the setting to show/hide each- and if Roku were to code that as a "fix" that would satisfy (almost all) parties.
However, given the facts and past behavior by Roku, this is very unlikely to happen (though it would be welcome if it did).