Galio and his issues

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There is supposed to be counter play to any champion, with counter picks and whatnot. It's just that Galio has too many counter picks and is forced to be last pick with a very risky first pick, otherwise you need to prepare for the worst. If he's against AD team, he can't do a lot of damage while being tanky. He has two options: Tank or AP. Both are pretty bad as is as Galio has some amazing burst damage and great tankiness when put up against some AP. So there's no real reason to pick him up if you don't know what the enemy team is, which is why he isn't played.

As far as i'm aware, we all know Galio is incredibly strong against the right team. Nobody thinks he's really weak, unless they haven't seen him against a partly magic damage team. So that's not really an excuse to say he's weak.

I could argue about the mana pool, as it is a bit of an issue pre-chalice, forcing him to aa early for cs. Though this is what assassins go through as well. It isn't too hard to start flask and get some early Merc Treads if you really wanted to.

What I can agree with you is the great comparison to pre-Graggy rework, who was greatly OP. That's the problem. Riot can't just make Galio have no counter play if they choose to rework him to make him less situational, because that would mean he's incredibly strong in any situation. Riot should balance him out by probably tweaking his passive and ult, the two very situational aspects of Galio to change him into something stronger more often as you could just pick up and play him whenever you want instead of having to be very lucky with your chances.

Love your argument though as It made me see more of Galio's character. <3

Who counters Galio? Simply saying "AD champions" is not the correct answer. Even if Galio is up against a full AD team, there will be DoT damage for him to heal off of (ex: red buff and fast autoattacks), and his ratios and utility can make up for him having to build both true AP and armor. The only champions I believe truly counter Galio are ones that have on-hit stuns (Braum being the biggest offender because his entire team will autoattack you during your ultimate; other on-hit stuns can be played around by a smart Galio). AD assassins/casters can offer him some trouble in lane, but as soon as he gets his Chalice, Galio can simply waveclear like a siege mage and farm up for AP and armor. Just because his passive doesn't provide as much benefit as it would in a match against an enemy team with a lot of AP doesn't make Galio helpless and useless; he can build like an AP bruiser and still do extremely well.

Galio's counterplay is having CC ready for when he ults and making sure your entire team doesn't set itself up to get Galio-ulted. He's easy to outplay in the early game if you don't rely on DoT damage (dodge his slow skillshots and poke him). Riot doesn't need to add or change anything to Galio because he has very few matchups that counter him extremely hard (Udyr and Braum), and he isn't complete garbage even if those champions are there to counter him.

Galio's good enough in general that his "bad matchups" are honestly not that bad for him. Just because he has to build non-MR items doesn't cripple him, and his natural strengths (waveclear, CC, damage, and tanking) are more than enough for him to stay relevant even against his counters. However, even in the best situations (enemy team is mostly magic damage with DoT damage), Galio's not as painful as pre-rework Gragas was towards every teamcomp (Galio needs to flash-ult if his team doesn't set up for him, magic penetration works against him, every team has an ADC that will do AD damage even if they do a lot of magic damage with it, Galio's Q and E are easily dodged, etc). He's balanced in that he's not overly bad or good against any enemy matchup, and him being well-balanced makes him underrated. For comparison, consider how long Cho'Gath's been considered an "okay against everything, not amazing against anyone" pick.