As everything in real life, nothing is ideal and capacitors are no exception. They have parasitics that in some applications must be taken into account for achieving the desired performance.
Once you have decided that you need a custom board for your product, you need to describe the features of your system so you can get a quote.
Terms like Arduino and Raspberry Pi are very common among students and hobbists alike. There are lots of development boards available in the market, and given their low cost, it's natural for some people to ask why shouldn't use a bunch of them for developing their product. Well as said in the title, it greatly depends on what your application will be.