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Because command substitution (`command` or $(command)) removes trailing newlines from the output of the commands performed.

I don't know what magic it is but I'm getting it right!!
y: print next byte
n: don't print next byte
q: quit
y
The input byte is:
48 H
y: print next byte
n: don't print next byte
q: quit
y...

There are a number of wrong presumptions in your post about how some Unix-facilities work. I will try to address them one by one. Bear with me, sometimes the relation of explanation and problem will...

I mean that one should avoid:
{ sleep 2; ps -f > "$FIFO"; echo "hello from $FIFO" > "$FIFO" ;} &
using exec is just one way of avoiding that...
{ exec >"$FIFO"; sleep 2; ps -f ;echo "hello from...

Yes or
#!/bin/bash

PIPE="/tmp/pipe.$$"
mkfifo $PIPE

(
echo 'value' > $PIPE &
)

VARIABLE=`cat $PIPE`
echo $VARIABLE
rm $PIPE


#!/bin/bash

TMPF="/tmp/tmpf.$$"
mktemp $TMPF...

I would use mkfifo instead of mknod. You do not need the ( ) in this case.. If you have more than one write statement, it is better to use exec, otherwise VARIABLE=`cat $TMPFIFO` goes on after the...

What happens if you have more than 1 instance if this script running?

I would suggest generating a temp filename for the pipe and passing it to the child.