It's an interesting discussion, one that I haven't seen for quite a while.
Personally, I feel like if you can respawn from a CP, you should be able to finish the track from that CP. It's how I learned to build maps from other experienced and creative mappers in United when I started mapping.
But thinking back to my pre-United days....
I was SO annoyed with the last map of the TMN ESWC campaign. Because of the way the game was made, I had to start from the beginning every time I'd crash.
I was so happy when I started playing United and I could respawn at a CP and continue after crashing. It meant I could finally finish maps. I guess that feeling has never left me, even though I respawn on maps less often these days... because yes... I want to set a good time.
The exception is when playing rounds, either on a normal rounds server, or in the MX Knockouts. I will use a respawn and finish the map if at all possible. In normal rounds I want the points. In the knockout, I'm just hoping someone else messed up worse than me and that they'll be last instead of me. The time matters less than the placement I come in at. And there are even fullspeed maps in there, so it's not all about tech and speedtech.
The beauty about TM is that we can build the way we like. If someone wants to build a map with respawns that don't work, that's their choice. I may withhold an award or not put the map on my server, but others may find no issues with it and award and host it.
Respawns are probably one area where Nations and United players developed very different philosophies, possibly because Nations had no respawns until Nations Forever came out.... by which time a tradition of not caring about respawns was already within the track building culture, and thus passed on from mapper to mapper.
However, United always had respawns.... plus many United players came from TMO and Sunrise... so a tradition of using respawns was there from the start.
Now we all meet in TM2 and different track building philosophies clash.
One isn't really better than the other. They're just different.