In one hand you are right, for example daggers need speed boost from dyes but right now its impossible on classic. In the other hand if you gonna implement speed bonus from dex, warriors like tyrant glad destro etc will be fcked up, they are pretty ok now but if dex gonna give speed they would be much slower than they are now(if they want to keep high hp pool and dmg and go - dex) and they wont stand chance vs ranged classes like mages for example. This change would have big negative impact on meele pts - they are not top setups right now so i dotn think we need to nerf them.
I loved speed bonus from dex aswell, this was making dex worth stat to boost, I always mained Abyss Walker with + dex dye, Now this class is broken cos of dex system, NCSOFT took away blinding blow for unknown reason (rly doesnt make sense for me and this sh1t making aw/pw useless and making TH only viable option- atleast on 1.5 classic). Now ppl piss on dex and go -15 dex because it doesnt decrease speed, evasion sadly doesnt matter much cos it works on god formula, atk speed matters alot but -dex decrease atk speed just a bit and you benefit more from additiona p atk or additional hp in MOST cases . But if you are going to implement custom change to dex, you would destroy current class balance. Some classes would become good but others would become useless and if u want to balance useless classes again you gonna make custom server with many custom changes that nobody would like to play.