I use one. but i have a false bottom that keeps all the hops from the spigot, plus the hops soak up a lot of the gunk. i am not concerned with keeping crud out of the fermenter (i try a little, but i havnt found getting crud in the fermenter it to be a big issue).
search the term ‘whirlpooling’ in regards to brewing. basically you swirl (whirlpool) the wort while you drain, this consolidates all the gunk near the center of the kettle, away from the spigot. try it out, on a small scale, with some sediment and clear water - in a cooking pot, too see how it works
most who whirlpool use something called a ‘pick up tube’, which is on the inside of the kettle attached to the spigot.
i whirlpool, but dont have a pick up tube. this keeps a majority of the crud inside the kettle. but like i said, i dont worry too much about crud in the fermenter. I’m sure others on this forum will have some better more thorough advice