If amendments won’t be followed, then no harm can be done. Why oppose a convention?
States will send delegates with commissions. They will not send representatives. Delegates are identical to agents. Their discretion will be limited to the power their states give them. States will not send representatives with plenary authority.
Do you oppose other clauses in the constitution?
Conservatives follow the constitution not liberals. This can only make things worse not better. I see no upside and only downside. The existing constitution is not the problem.