I think that RM weapons' tables should be mantained. I love them.
I also think that, after 20+ years, these tables are damnd old and... wrong.
Even in plate armour you can make a cartwheel (man-at-arms tried their armour this way, in effect).
Weapons chart needs a rework.
1) AT shouldn't have armor mobility factored in, nor QP penalty is done right.
2) AT should only represent the protection of the give armour, or armours, if layerd
3) AT shouldn't represent whole armour, but only protection for a specific location
4) AT should, in general, progressive in nature, and not a chaotic nature as we see on today tables.
5) RM could make tables in various ways: tables for every weapons, tables based on weapons effects, tables based on combat techniques