I wouldn't say those things are problems per se.
Only if you forcefully try to bring back some of the old rules. It's a different edition with rules written so they work in that edition and not in another edition. That's like saying all the traffic regulations today are bad because you forcefully try to make people ride around on horses again instead of using cars (and now imagine horses with tons of light signals attached everywhere and neatly waiting in front of traffic lights even though they could have passed the crossroads without a problem ).
True, but of the things I listed, do you think any of them are not problematic?
- current ‘my Shadowsword fires its fixed-axis cannon from its aerial at your flag’ LoS rules
- incredible lethality meaning the game is decided by T2, and generally by who shoots first
- units being allowed to waltz out of combat with no repercussions, leaving the unit that did all the work to reach them high and dry
- transports being entirely useless for assault units, since they get close where they want to be, then get surrounded and destroyed along with the unit inside
Don’t get me wrong, there are elements where 8th Ed is much better than 7th (like Movement stats and multi-damage weapons, for instance), but 8th has a lot of problems that would be solved by taking a look back at how it was done in the past.
That's ITC rule about getting round non-existent terrain modeling standards not due to the LoS rules.
Thing is, those standards haven’t changed over time, but the LoS rules have, and the first level of ruins blocking LoS wasn’t necessary under the old system. Which implies that the current LoS rules are the problem.