I have the Ryobi One+ 18v set of cordless power tools. Since I already had the set, I took the bait on the string trimmer since it came with another Li-Ion battery and charger. I know you are looking at the higher voltage stuff, but I’ve been pretty happy. It’s not as powerful as a gas trimmer, but for my lot, it will do trimming and edging on one charge with the 4ah batteries.
As to the blower, if it’s as you describe, for less than $10 you can get new fuel lines, a new primer, and (not mentioned) a new air filter and be back right as rain. Mine had the same problems and for 30 minutes of my time and less than $10, my 8 year old blower is now working perfectly fine again. I don’t see any reason to get rid of a blower that only needs a little maintenance.
I think electric is the future. I think batteries will continue to get better. I wouldn’t go back to gas for the string trimmer unless I had a huge lot.