If I relied on other people I would never get anywhere. I have trained mostly alone for the 9 years I have trained, and I will most likely keep going that way.
I don't think working hard without a coach is an issue. A couple of videos from my alone sessions that backs up my statement:
180kg x 20 (85% of 1RM at the time) reps in the squat:
160kg (94% of 1RM) 10 sets x 3 reps front squat:
I am still confident that a very good coach could add value to my training. However, I am only an amateur lifter, and I enjoy the process as much as the results, and I am not making a living off this, and I am not going to take steroids ever, so there is not like I am going to make a strongman career out of this. Altough I like working out and getting stronger a lot, I focus on my academic education, as that is what is going to bring me a paycheck, and pay for food, housing etc.
I'd rather train alone than training with some incompetent person that don't share my goals and values. From time to time I train with other powerlifters, and I do have the opportunity to travel to train at other gyms with lifters that are stronger and more knowledgeable than me.
However, since I have a gym in my basement that is available all the time, that suits me very well, and I don't have to use resources (money/time) to travel.
Training is not excatly rocket science, as long as you have a plan, and you do periodization, listen to your body, work hard, rest and eat well, then you will progress. Repeat this for a long time, and you will get very strong, stronger than most people.
As a side note I prefer lifting without equipment, I like going for a workout, do my routine, and then be finished. Using powerlifting gear takes a lot of time, and who ever got strong from the equipment? Strength is built from time under the bar, from the food and from the rest.
Powerlifting training with squat suits, bench shirts, knee wraps, belts, wrist wraps etc. do not appeal to me anymore. I think mostly it is a waste of time. Perhaps I will sometime in the future once again compete in a meet, who knows. For me this is an alone journey which I immensely enjoy.
For me it is not only about a new PR or results, but also about the process. There is nothing like a good workout, and the sensations that you feel when really pushing your own limits.
The dicipline and dedication in the gym can be transferred to other areas in life, and I also feel that the training builds self esteem, and brings me peace of mind.