Depends on the specific regulatory authority, whether they can be used in IMC...or not.
However, in some regions, some ILS is better than no ILS, especially on those dark, visual approach nights.
Yeah, I can do 'em without the ILS, but my First Officer needs a helping hand, he realizes this and tunes the ILS for reference.
Smart guy.
And, then we have a totally different situation.
On the ILS to 18R at LOS, low ceilings reported, all coupled up, everything looks OK.
Except, at 800 agl the First Officer (flying pilot) notices that the glidepath zooms to the bottom of the HSI.
Not good.
He says...going around, trim go-around thrust, flaps 22, gear UP.
Just like he absolutely should.
Smart guy.
Experience pays off, big time, make NO mistake.