Are you hard of thinking?
'Get on Mumsnet' = reach for phone on shelf 3 inches from my head where it charges at night (has to be close so my sensor doesn't lose connection). Tap, scroll, possibly open eyes.
'Fill and boil kettle' = remove covers, scramble out of bed, exit room, negotiate hallway, negotiate stairs, find wheelchair (may be at bottom of stairs may be charging in livingroom), get into kitchen (assuming no ones left shit in my way, boots/brooms etc), find kettle, take kettle to sink, fill kettle, take kettle back to worktop (all this is one handed trying not to kill the washing machine or dryer with the back of my chair or rip a leg rest off the front), boil kettle, find which cupboard tea bags have moved to now, reach up and pull down rack, find mug, ditto. Make brew, reverse out of kitchen to fridge, open fridge (it opens the wrong way) get milk, back to kitchen, add to brew, reverse back to fridge to put it back, shut door, back to brew, collect brew, back to bottom of stairs...then realise i can't carry a brew up the stairs as I need both hands for the bannister.
Even if I didn't rely on a powerchair, there are significantly more steps to making a brew than there are to just reaching for a nearby phone and accessing mumsnet. What might seem a simple task to a well, healthy, pain free person may be monumental to someone who is unwell, not healthy, in serious amounts of pain.