I'd rather ED and the third party developers modeled the aircraft sounds in all their glory, if people choose to use ear plugs while playing as a real life pilot would, well that's up to them ;)
I don't like to complain too much about DCS as I love it tbh, but sound is one of the weak links in DCS for me generally, it isn't bad but it isn't great either. I look forward to any improvements in this area.
Side note, that Lotus sim L-39 was excellent! One of the best addons I ever had for FSX, it even had rain drops on the canopy... :music_whistling: