I disagree. I remember when no client showed long-form content. We implemented it blending the new post into the feed and, it took some time, but others followed. Same for custom emojis, etc. If there is use, it helps people prioritize them. If there is no use, then no one needs to worry about it :)

Only if everyone switches to the new kind, kind 1's are here to stay, and deletions will only get implemented if people care about them (side note, next release will have some deletion support).