Real life opponents are likely to use knives or guns, so there may seem little point in learning elaborate weapons forms. Whilst the forms may enhance your tai chi, you will never be able to legally defend yourself with a sword/spear/cudgel/mace/fan without the risk of arrest.
In England, it is illegal to carry a weapon on the street.
Unless you are an expert in unarmed combat, the time committed to a weapon might be better spent developing empty-hand self defence skills.