The thread has gone off on to a massive tangent where folk are listing their annoyances.
There have been plenty of helpful answers but they are a bit lost amongst the noise!
The only old standard to avoid would be straight steerer tube – and they’ve been long gone. The op will be able to get non-boost hubs and 31.8 handlebars for a long time to come, even if just 2nd hand kit.
Superboost was a 2 fingers up at the pointless exercise that was boost spacing but it never took hold so became the exact thing it sought to destroy. Therefore spares are limited and should be avoided – but you’ll have a hard time stumbling in to that one.
Press fit BBs can be fine (we’ve had 2 for 8 years plus) but check reviews as some manufacturers seem to get them wrong.
Buy a good bike that you like the look of and go have fun. Check reviews for obvious shortcomings and crack on.