The current implementation of the reaction system is only going to feel worse at higher levels too when things like counterspelling come into play. Wasting a counterspell on an inconsequential spell and then having the entire party fireballed is not going to feel good. Not being able to control when reactions trigger really takes away from the system in my opinion.
That's actually a really good point, I haven't even thought about that. By the way, if you want to see this kind of gameplay where people can interrupt the flow of a turn based-game, look no further than MtG: Arena. It plays really well despite having a ton of instant interactions, and is basically the best videogame card-game that is out there.
