When I've peered through and used a SpectreDR, sure, there's an illuminuated red dot in there alright, but due to the parallax within the optic, the limited eye relief, it does not provide the same feature as an Eotech would in that no matter where I look though the optic, wherever the dot is, that's where the round goes.
So how does one compare the holographic red dot feature of an optic that is non-parallax with unlimited eye relieve to a non-holographic optic which is parallax and limited eye reliefe?
So to say "red dot on a red dot" may be techincally true, but the way each optic interfaces said red dot to the user are not the same so having both would technically not be redundant. Unless of course I am missing something and humbly seek input.