I'm not saying you are wrong. Building the era of custom tools just for your company, only to do specific jobs is long gone. This is for a lot of factors of risk in a business.

It would work, if management didn't treat programmers as a replaceable cogs in a wheel. But the day you seek to make the craft of programming a commodity that could be done anyone, you need a ecosystem whose knowledge is available to everyone. Only then would you get reasonable expertise at affordable prices to finish your projects.

The opposite is to make so programmers so special that the knowledge of specific tools is available only to them. This definitely puts programmers in a lot more special position to negotiate pay and other things at will. Because the very existence of a business depends on them.