It does actually matter the approach speed for an a380 to capture ils is at around 200kts or 190IAS at 3000ft msl.
That is correct, but your speed does not directly contribute to catching a glideslope. You could technically do it at 350kts.
I know that. That’s why I said “technically”. 
It was 220 kts (If I remember correctly), so fairly up there towards the limit of max APPR engage speed, but in a 787.
As far as:
There is Jan’s point:
But also I developed some “anecdotal prejudice” that the more you push towards that 250kt APPR limit (and it may or may not also be aircraft and distance from touchdown related), the greater you increase the chances of encountering the very occasional failure to capture GS.
But I haven’t tested the above sufficiently to say I am absolutely sure.
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787s are good they are highly maneuverable compared to 777s hence 220kts sounds fine I guess but don’t know much about the profiles so can’t comment about it.
It’s not recommended since you got to be stable when passing over 1000ft mark and reducing speed from all over 250 can make the whole thing ridiculous.
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Yes, so the main intercept criteria (in no particular order):
1)far enough out to have time to stabilize
2)however far, make sure you are level (3000AGL recommended) and below the GS
3)below 250kts IAS
4)below max landing weight (APPR won’t engage otherwise)
5)for localizer, limit intercept angle to 30 degrees or so
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