most projects I've seen on APIs can be switched around with a few weeks of dev hours.
For example Paypal and Stripe can be easily be replaced in most websites I know, sometimes with a simple click (install different addon). We moved from Parse to a custom API in 2 weeks I think (when it failed).
What I meant is:
the downsides of a language/framework on the long run are way more devastating and limiting (see Instagram/FB with their PHP for example)
the SaaS are limited to one feature usually of the project, cannot affect in most cases the entire project, you can switch them in small steps/soft releases/ab testing
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most projects I've seen on APIs can be switched around with a few weeks of dev hours.
For example Paypal and Stripe can be easily be replaced in most websites I know, sometimes with a simple click (install different addon). We moved from Parse to a custom API in 2 weeks I think (when it failed).
What I meant is: