Yes I read this story, and giggled as I read it. We are in the process of doing up our down size house. The idea of beautiful plans and everything carefuly measured is OK in theory, but does not always work in practice.
To start with you have to know in advance exactly where every bit of furniture is going to go. I have yet to meet anyone who has planned meticulously, then leaves furniture where they thought they would put it. You regret what you got rid of, while trying to dispose of what you took. The current owners might object to you crawling around their house doing detailed measuring, allowing for skirting boards, door handles, odd little bits just sticking out,, pipepruns etc, how wide doors will open, where the points are. You will need to calculate how you will get furniture up the stairs along the landing and into the place you want. Some houses have so much clutter in them (like the one we bought) that such measuring is impossible.
We were fortunate, because our house is a multiperiod old house we commissioned a full measured survey of the inside, done by a suitably qualified surveyor. Its main purpose was to have a full accurate architectural plan of our purchase
So we did, in effect, have the plan the OP suggests. But there is many a slip between cup and lip. Our furniture fits, but we cannot get one chest-of-drawers around the 360 degree turn from stairs to bedroom, the long narrow landing has a pinch point we failed to notice, another door is just that inch too narrow to get a piece of furniture through.
Furniture arrangements carefully measured actually do not look right, so everything has been moved around to form different arrangements that look better.
As for removal companies! No matter how you try to organise them, they ignore everything you do to help them. For our first three moves everything was labelled where it was going and there were clear plans everywhere. Three different removal companies and I spent my afternoon of each moving day telling the removal men where everything was going.
For our last three moves i have not bothered. It has saved my time and the removal men's. I just tell them where everything is going as they bring it into the house - and provide plenty of tea and biscuits.
As for taking paintings, photograph's, small ornaments, favourite pieces of jewellery etc would be much more important than taking furniture is how you end up with boxes and boxes of photographs ornaments, plus pictures, books and other bricabrac in the garage because you have run out of wall, furniture and window sills to display them.
We have no garage, so we have a storage room with neat heaps round it labelled: sell, donate, car boot sale etc, plus lots of kitchen stuff awaiting the kitchen extension.