I can understand what you are saying. But as a cav player I dont want to ride my full plate set all the time but to use it like 15-20% of the time would be nice, now it is like 3%.
To play as cav gets the attention of every one. What is happening is that Cav are being taken out of the game because of the cost. I would like to be able to use my rouncey for gods sake and not require arms for the poor. As for your argument about mobility and near immunity that is complete BS, mobility yes, but when someone LOLstabs you in 1 shot when you are in full plate I dont call that immunity.
Cav were extremely important to the success of Medieval armies, this is a Medieval themed game right? Let us at least be able to play with a horse and some medium armour and make a little cash. I love being fully armoured but totally agree there should be limits, just not the lmiits that are in place currently