Since the Universal Prayer is either copied from some liturgical aid or composed by a Liturgy committee or someone on the paid staff or by the priest, you never know what you will get!
Thus these should be banned as the UP can be inane, politically or religiously preachy or just plain stupid if not herectical.
And don’t get me started when the priest says, “what else shall we pray for” thus inviting anyone to put their two cents in, like, “for my philandering husband, that he may be converted...let us pray to the Lord.”
The Roman Canon has all the necessary UPs any Mass could ever hope to have and these are not inane, politically or religiously preachy or just plain stupid.
In the Extraordinary Form the priest himself could conceivably conclude his homily, which isn’t a part of the Mass, just tolerated, with intercessions. Then he puts the maniple and chasable back on for the rest of the Mass. I’ll try that at my next EF Cathedral Mass!