When I was flat-hunting, I was always very surprised as how many of the current owners had put in a false fireplace (with some sort of electric fire), along the longest wall in the Lounge. Always turned me off purchasing those flats. I had (still have), lovely range of expensive golden oak units (cupboards, drawers, display cabinet, etc), which need a long run of wall to keep together and these are more important to me than an unneccessary fireplace in a centrally heated flat.
Do not understand how a fireplace can be a 'focal point' in sitting room/lounge. Surely, these false ones are rarely, if ever used. I did have one in my last (1930's) house, with a gas fire. Had this all done when I first moved in, but later on regretted the waste of space by the kerb surround, and if I had re-done it would have just had a fire fitted IN the chimney breast.
The two radiators in my large Living/Dining room in my flat give me all the heating I require. Suppose, for me, the 'focal point' of the Sitting area is the Tv.