That was the whole point. For most self-respecting musical artists back then, the album was considered an art form of its own, not just a collection of songs. You were supposed to sit down and listen to the sides all the way through. Track arrangement, lead-ins and -outs, and run-on tracks were all given consideration by the artist, and that's how they wanted you to listen to it.
Track sequencing is still an art form. It's sad to see that disappearing.
Nimoy had one or two songs AS Spock one on album. If only Kelley sang just ONE song as McCoy and made the song about Spock
.....it would've been glorious.