See, I would entirely disagree with the idea that Bohinj is skippable - not just the lake itself, but the walk to the waterfall, Mt Vogel, Pokljuka, the dairy museum (ok, I like cheese)... Though it is a very outdoor destination, so I can see why it wouldn't offer something for everyone.
That being said, I still think it's worth staying closer to Bled than Ljubljana as any time you gain by not changing hotels will be lost in the back-and-forth. Radovljica deserves a day itself, and even if you only do the absolute tourist hotspots in Bled and Bohinj, you'd need a day and a half unless you really enjoy rushing.
Put it this way - on my first trip to Slovenia, I somehow managed the following in one day: early bus Ljubljana-Bled before 7am, walk to Vintgar Gorge (the bus wasn't running), queue then walk through Vintgar Gorge, hike back to Bled via St Catherine, wolf down a snack, get the bus to Bohinj, walk Ribcev Lav to Stara Fuzina, have a swim, take photos around the bridge, grab a sandwich, get the bus back to Ljubljana a bit after 5pm, then catch the tail end of Open Kitchen for dinner.
It was lots of fun, but I was an absolute zombie by the end of it and lost much of the following morning to total exhaustion (luckily the long brunch that was all I managed was relaxing!). Chopping the transport off either end would have been a far wiser choice. And there was no universe in which I would have got on another bus just to visit Radovljica that trip!
(We had previously stayed overnight in Bled, but I couldn't fit Vintgar and Bohinj into the same day as a Bled island pletna trip, hike up to the castle, a dip in the lake, a cream cake break and a walk around to the other end of the lake, and thus had regrets.)
In other words, I'd recommend sticking with multiple bases.