Can you give a couple of examples of helpful suggestions that made a difference?
It was often the slightly more subtle issues that were teased out. In Kent we became aware of a contra-peak 4-car service that was regularly overcrowded with students during term time (but hadn't really come to notice before) and were able to get it changed to 8-cars.
In Scotland it was pointed out that some Glasgow late afternoon suburban services on Fridays that ran as 3-car were overcrowded because of a trend for employers to have an earlier finish time on that day. We re-jigged the diagrams to strengthen a couple of earlier services but actually de-strengthen some 'high peak' services on Fridays only.
Somebody claimed that tickets were 'never checked' on their Strathclyde driver-only service and we discovered that there was a lacuna in the Ticket Examiner diagrams that did indeed leave 'their' train uncovered. We soon fixed that.
Sometimes it was a case of pointing out facilities that already existed. For example, someone complained about the queues to renew weekly season tickets on Monday mornings but hadn't realised that they could be ('continuously') renewed from Friday evenings. They were enlightened and we did a bit more publicity for the facility.
I'm surprised these events happen at all for fear of the managers being lynched, given how the railway has deteriorated over the last few years.
Being long retired I suppose that I am not necessarily aware of current passenger behaviour but back in the old days I've been out 'on the platform' in circumstances when thousands of people are being held up but never had any real problems. A bit of verbal abuse but nothing else.
What makes you think, the managers want to meet their customers, or hear their complaints.
We are regularly reminded on this forums how many rail staff are proud of their jobs and dedicated to providing high standards of customer service as a 'guard', booking clerk or whatever. What makes
you think that many managers don't want to do the same? Throughout my career I often reflected that I first started responding to public complaints/comments as a CO1 (lowest grade clerk) but was still dealing with them as a Station Manager, Operations Manager, 'Head of ...’, Director and so on. They are great for keeping you grounded. Not only in the office but at a MTM session, on the platform, on the train, meeting with stakeholders, giving talks and hosting visits for local groups, schools, colleges, MPs, Ministers, journalists, etc.
Gotta keep out there!