Yes, @Eldar’s Minimalist Library and Blocs Master courses are invaluable for many users, he certainly deserves direct credit for his efforts. Those offerings may likewise really help your transition with finally onboarding with Blocs.
Another important thing to note is that Blocs exported source is pretty standard Bootstrap, HTML, CSS, JS. Most developers could carry on with it inside IDE’s or apps like Pinegrow could easily open it to continue work. So the export is certainly portable, that can be part of a backup plan, if you’re concerned, also for your clients if something ever happens to you.
The Blocs email form still uses jQuery for validation and some third party Brics may still also.
Some 3rd party developers have seemingly left ( like Whittfield unfortunately ) so there is always the chance of that if you decide to rely heavily upon Blocs add-ons. There will always be a level of risk as you have experienced, regardless of what you decide, but you can mitigate risks the best you can with genuine decisions.
Your personal requirements are the essential factor. Give Blocs a try.