As far as I know, Jet 2 is the only airline currently flouting these rules by having completely unavoidable charges that get added on during the process
Nope, TSR2 you are correct. All the charges are avoidable. I went to Amsterdam for £2.99 as quoted on the website. You
CAN go to Palma on the date stated above for £19.99. Travel with your 10kg hand luggage, check in online and pay by solo or electron card. Its no different to any other low cost airline.
Seriously have a play with the booking system, every single day in November you can fly LBA-AMS, BFS etc etc for under a tenner including taxes. So where does all this rubbish about Jet2 not being a low cost airline anymore come from?