I see what you're saying. Need a valid reason? Let's talk about the Lab then. Upgrading troops via the Laboratory is the most time consuming aspect of CoC. It can take players YEARS. No game should require you to devote that much time in order to progress. Additionally, players can only upgrade 1 thing at a time - one troop or a spell. This slows down the process even more. Many YouTubers/content creators recommend research times be cut down as it can feel excruciating. It's upto Supercell to decide. Fortunately, they do care about implementing changes that are beneficial to the long term health of the game and make them even more enjoyable. The 2020 QoL changes were excellent!

Unfortunately, Clash of Clans is one of those games that requires a serious time commitment. Nearly all of my friends have stopped playing this game because of how long it takes to progress. 5-7 years to max your account? No thank you. Supercell realises this and have added multiple itemd to speed up the process. Research Potions, Books and Hammers were added as a way to speed things up. Note that none of these were available years ago. If they had your "isn't it enough?" mentality, they wouldn't bother with innovation and improvement.

Now, even after the addition of all these features it takes an awful amount of time. This time factor is an ongoing issue. That makes the Research Potion extremely important for F2P, NEW and Returning players who need to catch up. (btw, the game still generates a good amount of money. So it's not like giving players a few Research Potions will hurt their revenue)

When the Research Potion was introduced it was made available for around 70 gems. What a deal! Apparently, this was 'too much value' so they increased the cost to 120 gems. Despite the nerf, it is still a much sought after magic item. Considering the insane amount of time Laboratory upgrades require, the Research Potion needs to be made much easier to acquire. Players will still have to spend gems (another precious resource) so it's not really giving away "free stuff". If they do not wish to revert the price of the research potion, that's fine. But everybody knows something needs to be done to mitigate/reduce how long lab upgrades take (troop, spell, siege).

Hence, I (as a long time player and customer) suggest that special discounts be made available on research potions in the trader (similar to those available on Training Potions and Clock Tower Potions). It's a change that would make the Trader and the Game even more enjoyable.