Perhaps your DP found the transition from GCSE to AS/A2 Levels difficult... It's a big academic, emotional, mental and maturity level jump. At GSCE, most under 16s can just about juggle 8+ subjects, maybe less and maybe more, some are compulsory and then you have to choose one or two that have some link to future AS/A2 Levels. The stress starts mounting. AS Levels are a step up in terms of developing analytical and critical/creative thinking, and though these are voluntary, students are pressurized to pick subjects that have a link, they are encouraged to think about transfwrable knowledge/skills, employability and university points. A2 Levels appear to be a breath away from first diplomas or 1st year undergrad, as these THE ticket into university.
But regarding undergraduate degrees at university being more difficult than options-based further education, I disagree. The levels of emotional, mental, academic and maturity are really ratcheted up - this is dependent of course on where you go, the teaching and learning style, and it's the first serious step toward your career.
I remember during my 1st year at university being counseller to learn hard, then 2nd and even 3rd won't appear so difficult.
I chose to do a diploma at the same time as my undergraduate, and found that by 3rd year I was working as hard as any given NQT (my studies dictated that I should). My postgrad degree in comparison was a lot less in terms of stress management.
Depending on your chosen career, wherever you go, employers will not disagreed what you did at university, NEVER. It may appear so and that is dependent on your co-workers and their educational paths, they may not have degrees for example. If they want promotions though, they will have to do training or some kind of FE/HE. That's hard and harsh.
Seriously though. If all employers were selecting their employees by A levels only, the universities would be out of business. Some are swayed that way, yes, but they're most likely after one or two transferable skills which they will try to capitalise on, and expect the employee to further develop too. And generally, they won't have the know how or ability, unless they have been to university and got a degree.