If something works and is cheaply and freely available there is absolutely no reason not to use it and I am perfectly aware that many do. Most people will be in the position where it is more practical to adapt something else than start from scratch. Much depends on skill and facilities available.

That doesn't change the fact that it has many things that are not ideal. The same can equally well be said for motor conversions as most of them are based on high speed motors that are not ideally suited to conversion to low speed PMAs. That doesn't prevent large numbers of people from converting them and using them satisfactorily.

The discussion was about adding capacitors and I was trying to explain why it could be beneficial for the F & P by removing some of the worst effects of one of its limitations.

Motors and generators work on the same principles and largely they are reversible and interchangeable but they are optimised for their intended use and if you adapt it for a different purpose then it may not be ideal ( in a few cases it may even fail to work)