The biggest issue with Simplified Chinese characters compared to Traditional Chinese characters is the "degeneration" of multiple simplified characters corresponding to a single traditional character. The simplification of individual characters is a relatively minor problem.

For example:

"乾", "干", "幹" are all simplified to "干". Only a few instances of "乾" are retained, such as in "乾坤" and "乾隆".
"發" and "髮" are both simplified to "發".
"餘" and "余" are both simplified to "余".
"製" and "制" are both simplified to "制".
"衝" and "沖" are both simplified to "沖".
"術" and "朮" are both simplified to "朮".
"複" and "復" are both simplified to "复".
"後" and "后" are both simplified to "后".
"穀" and "谷" are both simplified to "谷".
"薑" and "姜" are both simplified to "姜".
"採" and "采" are both simplified to "采".
"徵" and "征" are both simplified to "征".
"係" and "系" are both simplified to "系".
"鬆" and "松" are both simplified to "松".
"雲" and "云" are both simplified to "云".
"豐" and "丰" are both simplified to "丰".
"裡" and "里" are both simplified to "里".
"鬱" and "郁" are both simplified to "郁".
"鹹" and "咸" are both simplified to "咸".
"嚐" and "嘗" are both simplified to "嘗".
"準" and "准" are both simplified to "准".
"鬥" and "斗" are both simplified to "斗".
"殭" and "僵" are both simplified to "僵".
...

The result of this multiple simplified characters corresponding to a single traditional character:
- Causes characters with originally different meanings to be mixed together, leading to potential ambiguity in information.
- Creates the issue of "one simplified character corresponding to multiple traditional characters" when converting from Simplified to Traditional Chinese.
This causes significant difficulties in the identification, analysis, organization, and transmission of information.

Especially in classical Chinese, ancient texts, and ancient medical texts, where the redundancy is much lower than in modern vernacular Chinese, a single character difference can often lead to a completely different interpretation of the entire text. After simplification, it is easy to produce erroneous sentences.

Examples:

Traditional: 在欄干旁吃完乾餅，準備幹活。
Simplified: 在栏干旁吃完干饼，准备干活。
Simplified to Traditional 1: 在欄幹旁吃完幹餅，準備幹活。
Simplified to Traditional 2: 在欄乾旁吃完乾餅，準備乾活。
Simplified to Traditional 3: 在欄干旁吃完干餅，準備干活。

Traditional: 姜先生在園裡種薑。
Simplified: 姜先生在园里种姜。
Simplified to Traditional 1: 薑先生在園裡種薑。
Simplified to Traditional 2: 姜先生在園裡種姜。
Simplified to Traditional 3: 姜先生在園里種姜。
...

Traditional: 為了幾斗米和店家鬥嘴討價還價。
Simplified: 为了几斗米和店家斗嘴讨价还价。
Simplified to Traditional 1: 為了幾鬥米和店家鬥嘴討價還價。
Simplified to Traditional 2: 為了幾斗米和店家斗嘴討價還價。

Traditional: 到理髮店剪髮。
Simplified: 到理发店剪发。
Simplified to Traditional 1: 到理發店剪發。
Simplified to Traditional 2: 到理髮店剪髮。

The degeneration of language and writing from precision to vagueness represents a similar trend in the cultural sphere. Simplified Chinese characters have been in use in mainland China for over fifty years, and the younger generation in modern mainland China is almost entirely unfamiliar with Traditional Chinese characters. The result of fewer and fewer people being able to read ancient texts is the loss of cultural heritage.