Honestly, personally I prefer looking up by radical in all circumstances where I can’t guess the reading, just because if I try handwriting and can’t find it it feels like it’s my fault, whereas at least if I can’t find it with radical search I can blame it on the tool more…
With the right tool and practice it’s not too slow either.
For 岬 for example, using the phone dictionary I like (Takoboto), I can search “yama” and hit “add to radical search” on 山 to start narrowing down, then add 口 as well and now and 岬 is the second one down. Which got me there in a couple seconds since I’ve done that kind of thing a lot at this point.
Incidentally, I thought this was an interesting opportunity to compare print and scan since I have both since the digital was free at one point (and I bought the originals before I knew digital was such an easy thing…). It’s not that different it turns out! You can really tell they just scanned it and color-corrected it.
Interesting how less sharp the shading gets though.