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No, in fact it's the other way around. The newts have a smaller central obstruction than an equivalent SCT.
You can collimate a dob. You can clean the mirrors. Mirror coatings don't deteriorate for 10's of years if looked after properly.
You really need to get to a star party and look through some SCT's, and compare it to your 12" dob. Have you collimated your dob? Are you happy with the views through it?
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