Oh dear...
Many of the weapons in the MA were not originally used as weapons but as tools for various purposes.
No, a very small number of weapons, largely associated with Okinawan (Ryukyu) methodology, have apocryphal origin claims along these lines… but the majority of weapons were designed as, get this, weapons.
The kama was a sickle for use out in the field. The bo staff was used for carrying buckets of water over the shoulder and the nunchucks I believe was used as a flail for grain to name a few examples.
Yeah… note the above mention of "apocryphal claims"…
Anyway, the tools of today can be used as weapons too. They should be incorporated into modern MA.
Hmm… that will really depend on the art itself. It's really got no place in a number of them… making blanket statements about what should or shouldn't be in systems is fraught with issues and can never be correct or accurate.
In other words, you're coming from an inaccurate understanding, with a lot of misconceptions, and are trying to apply that across the board where it's just not pragmatic, realistic, or appropriate. But, giving you the benefit of the doubt, and assuming that your single-definition way of expressing your ideas has lead to this particular statement, I'm guessing that you're actually meaning to say that, as a range of systems and weapons are thought to have their origins in more common, everyday items, rather than as purpose designed weapons (despite the fact that the majority of weapons are designed as weapons first and foremost), then perhaps modern self defence-oriented systems should look to other everyday items as potential tools for self defence as well… then… they do.
Systems such as MCMAP (and other military systems), Krav Maga etc teach the use of common-carry items in each of their contexts (using things like military shovels), there are a number of systems that have incorporated items such as Defensive Tactic Pens, kubotan, tomahawks, and more… and knives are possibly the most common form of weapon encountered in a martial art class across the board.