Errr.... welcome to the forum!
It's worth pointing out a couple of things. Firstly, on busy trains, the guard/TE won't get round everyone. This is a particular problem at the many unmanned stations in the Glasgow area, where there is no opportunity to buy before you board. Secondly, the barriers won't let you through without a valid ticket, but they don't control access to the trains. Someone could board a Glasgow-Aberdeen service with a ticket for High Street, for example. Hopefully no-one would be stupid enough to try that. As such, the guard on the Aberdeen train needs to know that everyone on his/her train has a valid ticket.
The barriers don't replace guards on the trains, they work alongside them. And believe me, automatic barriers are much, much more efficient than the useless "manual" barriers that plague Central station.
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Am I the only sane one left here? The last I looked there were ticket inspectors/conductors on the trains! Just because you can walk onto a train without a ticket doesn't mean you have gotten a free ride. The conductor comes up to you and you have to buy a ticket.
Yes, but that's assuming that they have time to get through the whole train, and it's also assuming that the customer is being honest about their origin and destination!
The manual barriers are present at the times stated because the trains are jam packed at those times and it is impossible for the conductor to go up and down the train inspecting tickets. At off peak times, where there are not manual barriers, the conductor generally comes up to you and and either inspects your ticket or you buy one from him/her.
But the manual barriers will let anyone with any ticket through. I once got through with an out-of-date seat reservation! (I can assure you that I had a valid ticket, but I just wanted to see what would happen!). In many cases, they just give up and let everyone through because they are so ineffective.
If people are getting free rides it is simply because the on-train conductors are not going their job. Why should Network rail pay for FirstScotrail's incompitence?
As you've said, people are getting free rides because the guard/TE can't always get through a whole train. On runs such as Carmyle-Glasgow Central, it's not reasonable to expect a guard to sell everyone a ticket in the ten minute run. But, on behalf of the many Scotrail employees on here, I'd like to thank you for calling them incompetent (or, as you've spelled it, incompitent). I'm sure they'll appreciate it.
Lets not forget that on Queen's Street a conductor comes and inspects your ticket just straight after you leave the station! How did you get on the train without a ticket?! Checked at the barrier, then checked on the train! Excessive!
But the manual barriers that you support aren't excessive? They serve the same purpose. And, as I've mentioned before, you can get through the barrier with any valid ticket for that station, but it may not be valid on the train.
In Queen's street I used to help my relatives onto the train with their heavy luggage, I can now no longer do that. Had I been stupid enough to jump on the train when it left I would have to have bought a ticket to Aberdeen anyway when the conductor came by. Help them on, wave goodbye and leave the platform.
I think it's fair to say that this is a significant drawback to the barriers, but once again surely you can buy/obtain a platform ticket to let you onto the platform?