"Not only that, if you are a startup that wants to do b2b and you want to sell a product in to that market that will have a tight connection to stuff your clien

"Not only that, if you are a startup that wants to do b2b and you want to sell a product in to that market that will have a tight connection to stuff your clients already run you will be required to use .NET by your customers. Unless you like uphill battles that's the way you'll go eventually." It's an uphill battle, but it's not impossible. My last job involved me writing Python for insurance companies. Yeah, there's always someone who won't accept anything that isn't written in .net or Java. But generally speaking, it's only a select few on your customers' team that will even know the difference. For the most part, businesses do actually focus on what's best for their bottom line instead of framework ideology.