It's just OCD people not having anything to bitch about in life. But to add to the point:

4. You are just ctrl-a away from changing source

the common use for me for example

    cat f.log |grep sth # okay it shows in history; C-a
    tail -f f.log | grep sth # let's try to repeat it live; C-a
    zcat f.log.1.gz | grep sth # no dice, let's try to dig a bit in history