Suppose we go to "Configuration" -> "Hosts" to see our 5000 hosts. We click on the checkbox to the left of "Name" column to select all hosts. The frontend apologizes about the maximum number of elements to remember (see attached screenshot). This is a perfectly respectable behavior from Zabbix, except it apologizes multiple times (in this case, 9 times) and selects all hosts anyway.
While we are at it, the message should probably be changed to something like "We are sorry, the maximum possible number of elements to remember has been reached.", so that it is a slightly better English.