Yes, you do need to make sure you're not too far from shops and life in general. And I would never move to somewhere really remote. We live within 20-30 minutes drive from 6 big towns and cities, and have shops within only 7-8 minutes drive. (about 3 miles.) The GP and dentist and vets and pharmacy and anything else we might need is there too. (In the little market town.) A large hospital with an A & E is 14 miles away (about 20-22 minutes drive.)
We need a car to get anywhere because there is no public transport in the village, but when we lived in a suburb of a large town, we still needed a car. To get the DC to different places, like clubs and hobby groups, for DH's work (he does shifts and public transport has never been any use to him,) and also hospital. Even in that town, we were still 10 miles from the hospital, and it was 70 minutes on the bus and you had to change buses at the town centre and wait 10-15 minutes for the next bus (but it was just 14 to 16 minutes drive!)
So things are not much different in the countryside really (for convenience.) I mean we can't get a carton of milk at 3am, but who cares, we've never needed one!!! When you're living the country life, you learn to stockpile. We have never run out of anything.
Not having a 24/7 shop open nearby, is worth it to live in the stunning place we live now. It's so peaceful and beautiful, and some days we can hear only birds and nothing else. Surrounded by farms and woodland and the river and the canal...
We really do need a car, but have only been 'let down' by our car/had our car break down 3 or 4 times in about 12 years. People I know who use public transport are let down WAY more often, with cancelled trains, and late trains, and so on...