Never caused me any concern at all.. When we told pilots to establish on the localiser and, later, to descend on the ILS... "Fully established" let me know that they were on the glide too.
Now what used to really, REALLY, REALLY get up my nose were the idiot pilots who would not read back the speed on final approach - and I didn't have all day to keep on and on and on at them.. The conversation would go something like:
Me: Descend on the ILS, 160 kts to 4 DME".
Pilot: "Descend on the ILS, roger on the speed".
Me: "Confirm 160 kts to 4 DME"
Pilot: "Yes, we got the speed OK"
Me: "160 kts confirm"
Pilot "Confirmed"
99% of the time it was Brits. Foreign pilots were very good at readbacks. I hope things have changed....