The life you describe sounds lovely. But it relies on a few factors:
The idyllic seaside location needs to have people living there permanently, not just 2nd-homers who appear occasionally or let the property to holiday-makers. This is because non-residents will not keep local services running - schools, GP clinics, pharmacies etc.
The close-knit community needs to be loose enough to welcome a newcomer. This is not my experience in (sorry) Cornwall who seem to think you are stealing the cottage from the previous occupants.
The village shopkeeper needs to be discreet and not tell everyone that you have just bought wine/condoms/thrush cream.
Your cottage needs to be on the delivery route for supermarkets, Amazon whatever. Many are just too remote. For the same reason, it may be tricky to get plumber, electrician, builder.
The cottage layout and size of doors needs to accommodate new furniture. If you can't get your beds, wardrobes, settee, fridge in through the low front door, round those tricky bends/low ceilings in the hall way & staircase, then you can't have those beds, wardrobes, settee, fridge. You might not realise this until you try.
It will be more relaxing if not an area known for coastal erosion - parts of Devon, Cornwall, Suffolk plus others.
Also more relaxing if not a place where small boats of asylum-seeking migrants regularly arrive - Kent.
Otherwise, go for it!