While there are some tools that are extendable, the vast majority of products don’t have this feature since most are not longer than 32”. The advantage of such a design is that you get a large grabber tool in a compact and portable shape that you can take with you outside and store easily anywhere since it doesn’t take a lot of space.
There are models that feature a foldable design that is very similar to the extendable grabbers, the only difference being that the product folds in half with a slip joint. The benefits that this type of product offers are almost identical and this type of design is more widespread.
Do keep in mind that the slip joint does make the unit more susceptible to breakage if the lift capacity is exceeded. Overall, if you want to get an extendable product, you should be ready to spend more time searching since the vast majority of grabber tools are either extended or foldable.