I don't think that's quite right. It's the same way Formula 1 racing contributes to regular automotive industry. Technological innovations could be adopted by more mainstream industries in a few years. For instance SolarFlare NICs used to be almost exclusively used by HFT players and can now be found in most CDNs or latency sensitive cloud providers.
That same article was then cited by French member of parliament Martine Wonner as being sufficiently peer reviewed and having the same value as a paper published by Lancet, with intent to let doctors prescribe hcq as they see fit.
As a customer I use one email address per service, using a catch-all on my domain name.
As a business, I have about 3 or 4 email addresses for each business and all of them are managed through a single fastmail.com account
You need to be very careful when using the term "bank".
It's a very sensitive and regulated domain and depending on the countries you're targeting, you may have to remove it entirely until you have the appropriate licences to use it.
I was also hesitating between Valencia and Barcelona. I ended up choosing Barcelona because there would be more job opportunities for my SO who doesn't work remotely.
Valencia is much cheaper than Barcelona but doesn't have a big airport nor as many good restaurants.
As for the best and worst things, I think they're valid for both Barcelona and Valencia:
The best thing is actually a combination of many: excellent weather conditions, relatively cheap cost of life, great food, access to the beach, overall good quality of life.
The worst things are the noise (cars and people) and communication.