I've never been "banned" from transiting Class D airspace in UK. I have on a small number of occasions been held outside. Sometimes I've chosen to wait, sometimes I've changed to plan B and gone round instead.
I've found it possible to get SVFR transits of Class A airspace in UK much more often than not.
I've never had a problem accepting the way the UK's "LARS" system works, or not. It is less easy to obtain a LARS service than in years gone by because quite a number of the units providing the service have been closed (mainly military units). Pilots have to adapt to changes, it's what we're paid for.
I've only been using the airspace since 1973 and since 1977 for a living, all of it non-airways but a fair proportion under IFR over the last fifteen years or so. In this branch of aviation we fly routinely operate VFR-IFR-VFR OCAS because we have no choice (probably more than most pilots do) but perhaps I'm missing something.
In any case, if anyone isn't happy about the setup of UK airspace, there's absolutely no point getting grumpy to ATC about it, it's not them making the rules, as in "don't shoot the messenger"!