If you make the portable dispenser even worse then you can really as well play medic instead

Seems I'm not the only one who doesn't read the other's post carefully

..... typical of the internet its full of retards who jump on one line and then keep bashing that while totally forgetting the grand picture of what someone was trying to do with his post.
My intention was simply to show a good and fun update to the engineer that wouldn't overpower or underpower him but would give him a role in an attacking team. Of course I can't say the dispenser has to heal like a level 3 or a level 0, because I can not playtest it. A medic is a single target spike damage healer, the engineer in my update would be a area of effect healer, of course not as effecient as a medic because he can't overheal but he could make your assault a little bit more solid. And allow other classes who don't get the undivided attention of the medic last longer.
Thanks for calling me a retard.
To be fair, your backpack-dispenser, as you "designed" it right now, would be downright useless. It would basically be the same as the medic in Team Fortress Classic - in case you do not know, the Medic in that game was entirely used as a combat class to capture the enemy flag because his medpack was the most useless item in that whole game. It was melee range only (you had to hug your teammate to be able to heal him) and it also wouldn't overheal very much (like 2% hp per "attack"). It's basically what you want to do to the engy right now - except that he could still shoot which doesn't do much because Engies deal average damage close range while also having average walking speed. They get outfragged by every other class in the game unless they have their sentry up, which is also very predictable as everyone knows the engy/sentry metagame after 2 years.
I did not say anything about the backpack teleporter - that might actually work out. I did not explicitly state that though because I fucking hate your way of argumenting, because it's not argumenting (My update IS good and fun, and you are all stupid if you do not agree.).
Imo, the engy just isn't deep enough because of his stale telegraphed play style. I mean, this game is out for 2 years and this guy's game is the only on that hasn't been changed ever since. Any other class can be played offensively, defensively or supportive (to a certain extent) but the engy is and always will be a turtler because of the sentry's limitations. In order to change his style of playing, you have to give him another sentry gun with different properties.