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“Roasted on fire” does not equal “oven roast”. Why no “oven roast” for Seder?

This is a follow up to this question. The answer there explains that ther was confusion / concern about roast.

The verse regarding the Pesach lamb says:

Exodus 12:9:

כִּ֣י אִם־צְלִי־אֵ֔שׁ

but roast with fire

Sounds like "barbequed" meat or roasted directly on the fire. Most roasted meat nowadays, and I assume, then, when Taz wrote this was done in an oven or some other method that was not barbeque or roasted directly on a flame.

Now, may ovens are electric, yet many Ashkenazim would still consider meat cooked in any oven (except, perhaps, microwaved) as "roast".

My question is, considering that the cooking method used then and now is not the same as what is mentioned in the Torah, why was there any concern or confusion to begin with?