The chief designer mentioned the front part of the bike (the joint of GF Polymaid and Metal tube) was destroyed during a test with solid tyre. There may be more damage found in the test, but we didn't get into detail much. He just told us,
"Please stop them."
Of course the choice is still up to us and I also do some mods to my A-bike which upset the designer in certain extend, but we should be aware of the risk of mods. and think how to avoid possible accidents.
I'm happy with normal tyres at the moment.