If you haven't ordered your power chair yet, including "anterior tilt" aka "Active Reach" provides more options if you still have some arm function and will also aid in transfers with or without arm use, along with the seat elevation function aka "Active Height" that every PALS should have. Depending on your plan and whether it's Medicare or commercial, you may pay extra for some features.
Robotic and other artificial arm extenders will just have a very limited lifespan for most PALS. But postural support remains important for the entire body, to reduce pain, contractures, and shear stress that can cause skin injuries (sometimes called "bed sores") even when there is no longer mobility.
If you already have a chair, an important part of safety and functionality, whether with a grabber or not, is good postural support so you are stable while reaching/lifting/pulling or even just keyboarding, doing arm exercises passively or actively, or sitting. Of course, you also want support if traveling in a motor vehicle, in transit, outdoors, anywhere holding your center of gravity might be at risk. It's also more comfortable not to bounce around. In a bus or train you would also use the transit connectors with your wheelchair's transit slot.
There are products such as light switch handles, key turners, and a handle that goes into a car door striker, that can be useful in extending arm function when weakness has begun. There are also arm supports for keyboarding and other desk work -- the ErgoRest line and its clones, as well as a wheelchair arm type ("Dynamic Arm Support," available as an option on Permobil chairs; disclaimer -- I did some early work with it years ago) that helps protect the shoulder from pain and subluxation and hands from contractures when arm function is no longer the issue.
Many PALS have a cheap "seat belt" on their wheelchair that they seldom/never use because it's uncomfortable, obtrusive, or doesn't work well. But extending your body from in an unstable position is dangerous because you could fall or subluxate your shoulder(s), for example, since the loss of muscle weakens the joint. Depending on how the wheelchair order was written, Permobil no longer supplies the same grade of hip belt that it used to, as a default.
Postural support can be padded or not, and is available in different configurations to wear on any combination of your shoulders, chest, hips, abdomen, calves, ankles depending on your needs, with different kinds of buckles as well.
If you can't easily access an ATP (they work at DME suppliers or clinics and are typically the same person who measured you for the wheelchair) or other professional to fit you with something like that, one DIY solution is the Elastic Mobility Strap, formerly the Universal Elastic Strap, made by Bodypoint, which also makes the other supports mentioned (disclaimer: I worked there). Never use homemade solutions like sashes or pants belts, which can fail/dig in, and cause serious injury.
The Strap is made of a cut-to-length cushioned, machine-wash/dry material allowing for a velcro-like attachment at any point, and wraps around whatever part(s) of you and the wheelchair or lift chair that need connecting, and/or connecting the wheelchair with a seat. It and the extender strap that can make it longer are available on line in different widths.
Of course, tilt/recline/footrest position changes throughout the day help not only in pressure relief, but can be used to help you more easily perform tasks or just read, watch a screen, etc. An adequate wheelchair back, seat cushion, and headrest all work together with any other postural support, just as is true in bed with your pillow, mattress, overlay, and discrete foam cushioning supports for heels, elbows, whatever you need.
