To be utterly fed up of what UK workplace culture has become?

[ExpectationManagementCharm]

I'm a middle manager in a large UK firm. I am not a new manager; and I'm not young, late 30s. I am generally perceived to be at the "laid back"/supportive end of the management spectrum (but I'll fight tooth and nail for one of my team if I think they're being asked unreasonable stuff/being treated unfairly).
However, I'm tearing my hair out at being at the "crunch point" of upper level expectations to get on and deliver stuff vs. how my more junior employees expect to work these days. I'm so exhausted and getting no support from anyone. I can no longer see if it's just my workplace or the norm.

Example1: Junior staff expecting to not dial into team meetings beacuse of trivial reasons - some of which are downright unprofessional (i have my weekly run with a PT booked then- but this is within normal work office hours e.g. 2pm on a Thursday). While my HR policy states that I need to be "flexible" for personal reasons, which means I then need to follow up separately with that person each time. Result - less work for employee, HR is happy, senior management say no problem, more work for me.

Example 2: Junior staff (especially our newly graduated colleagues) expecting to be able to get out of (reasonable) work deadlines by using the word "anxiety" all the time. "I couldn't deliver a client item/I was feeling anxious" (meaning I had to pull an all nighter to get it finished to meet our deadline). I try and escalate to HR - but I need to be "understanding". Result - employee's piss poor performance slides, HR are happy, senior management say no problem (because client delivery didn't suffer), I get to work an all nighter to cover the gap.

These are multiple examples, across lots of team members over the last ~ 5 years, but it's definitely got worse over the last year or so. The concept of "my word is my oath"/reliablility seems to have completely gone out of the window.

Yet my employer's HR team just turn it back on me as a team manager to manage, leading to more work, which means I just have another thing to do.

I'm currently pursuing performance improvement plans with 2 of my team at the moment, whose hiring i was not involved in, and i'm going mad trying to fit in what HR expect (to follow the process) alongside juggling my own actual workload. I'm not just a people manager, yet HR seem to think i have free time to spend doing delicate, intensive people management activity, despite my already crushing workload.

Does anyone else recongnise this or is it time to look for a new employer?

FWIW, i love my team (in general) but the recent piss taking has really taken its toll - I feel like no one at work has my back at all.

If your work has flexible working then you have to honour that. However, you can (a) ask them if they would mind moving the session to accommodate the team meeting. (B) Alternatively, move the meeting and let the team know that attendance is mandatory and for them not to book anything over it.
With asynchronous working, there should be the understanding that you will have regular meetings, and you should communicate this to your young team.

I don’t think the issue is that you’re nice or to soft; it’s that you’re not managing their performance. They’re young, and inexperienced and it’s your role to guide them and set expectations. Have weekly catch-ups, in which you discuss their work. What they have been working on, where you can support etc. Have a live document which is updated weekly with topics to discuss - they should fill this in. You can review any action posts at subsequent meetings.

Have any team and individual objectives been put into place? Are you reviewing these regularly? If they’re unable to complete tasks they need to tell you well in advance. All part of working well as a team. Can they work in pairs?

Round Robin at team meetings where everyone gives an update on their work in progress.