Yes, Austin, I've done ALL of those things - and I ACCEPT the consequences of that behavior. I don't moan and groan about how those things should not be "illegal" - there are reasons why they are (and I'm glad they are because if they weren't, there would be chaos and injury).
Same is true for not amending a plan..... It happens - but there are consequences. If there weren't, there would be chaos on injury.
BTW, the lack of sophistication of the plan sponsor isn't really an excuse. They are sufficiently sophisticated to be an employer and to sponsor a plan. Keeping it up to date ranks right down there with making sure payroll is on-time (and if it isn't, there is a DOL consequence) and that taxes withheld are deposited on-time (and if it isn't, there is an IRS consequence). We tend to get into the belief that businesses can't follow rules and woe is them for having to comply (which includes labor laws, OSHA, environmental laws, tax laws, zoning laws, insurance requirements and lots of other things that we actually ALL appreciate because they protect us from abuse at the hands of those who think they can do anything). But by and large they do comply, and if they can't they shouldn't be in business - or at least shouldn't be sponsoring a plan.