make EOs short term. After 3 months it goes away unless congress passes it.
Basic civics lesson 101:
Laws are complicated. And despite Congress's best intentions, often can't detail every possible edge case that might get caught up in the wording of the law.
So, the next step is that the executive is tasked with enforcing the law. There might be complications that crop up after a time due to unforeseen consequences, or even just not enough resources to adequately enforce every letter of hte law.
So the executive gets some discretion, and an executive order (ideally) is nothing more than the president saying, "We are prioritizing enforcement in these areas first (a la, deporting people with criminal records), because we don't have the resources for everything all at once and this is the most important area to begin with" Or, "Congress specified a list of possible exemptions to this rule, and we think X applies and will be providing exemptions given condition X".
All is well as long as the executive is more or less issuing good faith interpretations of existing laws. There might be some quibbles, but they usually can get settled.
But as we've learned in recent decades, it's possible a president oversteps and issues an EO that is really bending the law in ways that are not faithful interpretations. In that case, there are two mechanisms for redress. "Checks and Balances" if you will. One, Congress could issue clarifying legislation saying, "No, we really didn't mean to have X be an exemption and are issuing this amendment to the original bill to specifically exclude it from any exemptions". Second, someone affected by the EO can sue (This can even be Congress itself, I think, but lawpoke might know better) In that case, a federal judge will look at the law, hear both sides, and read the EO and decide if that is a legitimate prioritization/interpretation based on any jurisprudence and the written language of the laws/EOs. They can either let the EO stand or declare it invalid.
Letting EOs only be applicable for three months would wreak havok and tie down congress to do nothing else but look at EOs. Even in normal times, there are tons of EOs. And mostly not controversial. For example, Congress writes laws dictating how to handle classified material, and penalties for being irresponsible with it. But outside a few niche areas (mostly in nuclear weapons) Congress doesn't decide what is actually classified or not or how to classify it. That's left to the executive, and can be amended as needed by EO. Specific marking styles, declassification procedures, etc can all be amended periodically by EO. And they are. And Congress should not really have much interest in that because the details of implementation are intentionally left to the executive, and can be authorized via EO as appropriate.