Yes, we were streaming for 24h about Liferay DXP and Liferay Portal 7.3 (and previous versions). All kinds of technical information that might be of interest for you. You might have missed it, but luckily we have it all recorded - and the recordings are available for you:
Liferay doesn't have a solid and developer-friendly solution for building a SPA inside Liferay. We find solutions that give us the ability to create portlets in any FE framework with all the benefits like hot reloading, routing, etc and but also giving developers the opportunity to use Liferay object, language keys, and everything from Liferay.