But it’s still Boeing staff working on Boeing aircraft, isn’t it?I believe all the major airlines (and most of the others) do their own maintenance. Airliners are so maintenance intensive that it's only practical for them to do it themselves at their own locations.
Boeing has definitely got some issues with the 737 MAX-7 and-9s (software and the infamous door plug thing). That's for sure.
But most of the recently reported stuff since the door plug thing has been on airframes that have been in service daily for years and has occurred on parts that frequently swapped. The incidents with 777s where one had a hydraulic leak (reported as fuel at the time) and another had a wheel fall off are prime examples. Both airframes had been in service long enough for each of those parts to have been inspected dozens if not hundreds of times, serviced quite a few times, and replaced multiple times by airline maintenance staff since leaving the factory (they're considered high wear / consumable parts).
blancolirio on youtube is a great resource for high profile cases like this.
Here's his video on the hydraulic leak.It's a bit unfortunate that the media has latched onto the name Boeing for these things; it's most likely to happen in the US with a Boeing product because of their market share. But it's misleading to blame Boeing for all of it. Commercial airliners are intensively used and require intensive maintenance. Think of them like semi trucks: run hard and daily. It's one thing if a Kenworth new from the factory has a major issue (i.e. Alaska Airlines door plug incident). But most of what's made the news since then is more like a Kenworth with 500,000 miles on it having an issue with a tire... not exactly a situation where one's gut response should be to blame Kenworth.
If you're in a finger-pointing mood, then, well, there is definitely one company that's had more of these maintenance-related incidents get reported than any other lately: United. Not coincidentally, their fleet's average age is higher than most air carriers too. Southwest seems to be taking second place.