Cruel and heartless for what... believing that the country has a better future, not tied to the EU, can make our own decisions thats not cruel and heartless...that is the remain ideology.
It limits the future of everyone. In particular younger people who may want to work abroad for a few months or a year.
We will still be tied to the EU, we have to be to trade with the EU, to fly planes in EU airspace, to allow ferries to dock.
What we want is to trade with who we want, not have to pay levy's to be in a group, to think on our own and have an identity.
There is nothing to stop the EU or anyone else imposing a levy or levies on trading.
It also depends on whether the places we trade with have products we want. There is no British manufacturer of pacemakers, so if you need one it has to be imported. Currently from Ireland or the Netherlands with some from the US.
NHS staff are trained by the manufacturers, partly in the hope that you will use their product. Now while there are some things common to all pacemakers each one has its own features and different pacemakers are implanted in different people to suit their life style.
Obviously a no deal will not stop the import of pacemakers from the US, but if the US manufacturer does do a pacemaker with a feature that is best for the patient you have to look elsewhere.
India now has a couple of pacemaker manufacturers. They may be excellent, they be less good than European ones. But has anyone been trained to program them?
Assuming the Indian manufacturers' do offer free training then it still involves NHS staff being away from their jobs for a few days.
Then, with using completely new products you just have to cross your fingers there isn't another Bjork–Shiley valve fiasco.
Oh and pacemakers are not implanted on their own, they need leads that connect the pacemaker to the actual heart.
This is one type of medical device, implanted every day. I have no idea how many other medical devices are also potentially effected by Brexit.
But apparently you know about this and it won't be a problem.