Bigwolf's collie is unusual for a collie. Although many collies need to be taught how to deal with their frustration and taught to relax and chill and not to get to over threshold.
I have collies and also foster and rehabilitate collies for rescues. They do need some exercise a day but not as much as people think. Mine always get at least 2 hours walk a day but that is because I love it as well as they do.
Collies like to use their brains, they like to be working (not necessarily sheep dog work) but a contented collie is a collie that gets a mixture of brain work and physical exercise. I would question why you would get a collie if you do not want to be doing things with them.
For example that may be a bit of scent work, obedience training, dog sports etc or just enrichment. I map this into every day.
Collies can have "issues" so the timid part of the collie would need investigating. As collies can be quite reactive to other dogs, noises etc.
Noise phobic collies can be hard to live with and may make major restictions to your life. eg where you walk or where you can go. Timid collies may not be happy to go to pubs and cafes for example or to different areas on holidays.
Nervous collies may also show difficult behavours as a sympton of this.
If the dog in question has an "issue" think carefully if you can live with this longterm. Yes it may improve but it may also be an ongoing problem needing a lot of training and careful handling.
So I would ask a lot of questions about this.
Be warned if you once have a collie you will always want a collie.
< Looks at the 6 lying on their mats> (Some of mine are working dog though!)