To date, every audit, recount, signature review, and court case has found illegal voting rates so low they have no statistical impact. Meanwhile, multiple Republican-backed laws have been struck down by federal courts for intentionally or disproportionately disenfranchising specific groups of eligible voters.
So one side is dealing with documented, court-verified disenfranchisement. The other is raising a theoretical scenario that has no evidence behind it. Hypotheticals do not outweigh the real, observed effects of restrictive voting laws on lawful voters.