The mastodon search field has its limitations for finding #groups, cause you have to know or to guess the first letters of a group. If you enter another part of the name you cannot find a matching #group. A list with all groups or a #keywordSearch would offer the ability to find groups via any part of its name. At least groups exist to find or to publish posts of a special topic. Therefore you must be easily able 1) to find them and 2) to see the posts. Otherwise groups would rarely make sense.