I can't recall the last time I actually bounded to an objective with support fire from my team and teammates...that's not tacicool, that's damn comments sense but it seems it frowned upon a lot of the time.
I wouldn't say that on itself is frowned upon, but it's a VERY rare occasion where they don't need 5 minutes+ to set up to do a thing like that. And the moments it usually happens is when there's a single enemy sitting somewhere and they need 10 guys to do a flanking attack with suppressive fire. Sure, it's a nice tactic, but you could've also just walked straight to the point with 5 people all shooting everything that moves and you'll be there in a 10th of the time with the exact same effect. Sure it's just 5 minutes, but a in a lot of cases they actually do attacks like that have 0 value to the team. Meanwhile you're trying to defend an objective and there no people left to even attempt an attack on the next objective.
As for getting shot and respawning when there's a medical system.. Again, thing is that it's not rare at all to see large squads getting wiped out way out from any point of interest. Then they wait for a medic to run 200m to medic them. About 5 minutes later everyone is patched up and they're still sitting in the middle of nowhere. In those 5 minutes they could've all just clicked the respawn button once, spawned at base, load a truck up with FOs and set some up if they wanted to. Now if you have a squad on the other team that did decide to do that instead of waiting ages for a medic it might've cost them 5 tickets short term, but long term they have better spawn positions, brought some vehicles and supplies along and have a new line of attack.