It is all about trade offs. We had a good application developed as a SPA and worked well. However we had a monetization flow where we took users credit card det

It is all about trade offs. We had a good application developed as a SPA and worked well. However we had a monetization flow where we took users credit card details and bunch of information. We developed this flow as a separate stand alone HTML pages and micro optimized, reduced css, used vanilla js and put it on CDN. That did bump up conversions by good percentage points. It is all about choosing the right hammer and nail for the job.