When I reamed the holes on my 84 300SD and had trouble getting the reamer in. It had 250K on the engine and I have no idea if previous owners had ever cleaned the holes. I bought a reamer and I'll run it in the holes every time I pull the glow plugs.
Imo, you're rolling the dice by not reaming those holes. If you care for your injector system properly renting a reamer from a member here may be the right way for you to go. I have no idea how often reaming holes needs to be done. I just know that I'm never going to have issues getting plugs out or putting them back in.
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84 300SD
85 380SE
83 528e
95 318ic
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