Scientific articles contain way too many acronyms.
Some acronyms are used so widely used that spelling them out is not needed. For example, ECR for Early Career Researcher. Or more field specific, such as RT for Response Time, or GWAS for Gene-Wide Association Study. Acronyms do run into trouble when they could indicate different concepts: e.g. does your ML mean Multi-Level? Machine Learning? Maximum Likelihood?
More often than not, using Too Many Acronyms (TMA) can make your writing harder to read.1
A pithy example:
Many writers use Too Many Acronyms (TMA). Two challenging sub types of TMA are Too Many Unusual (unfamiliar works too) Acronyms (TMUA) and Too Many Overlapping Acronyms (TMOA; Similar also works, but then we would use TMSA). When TMA (or TMUA) occurs, the writing is both Hard To Read (HTR) and Hard To Follow (HTF). Writing that is HTR makes individual sentences more difficult to parse, insofar as it requires the reader to employ more executive control (EC) and Working Memory (WM) to recall TMA in order to understand the sentence. A knock on effect is that the writing becomes HTF, i.e. the reader must continually check All the Acronyms (AtA1) and All the Abbreviations (AtA2) to ensure they are following the thread of the argument. If the reader is anything like me, eventually the acronym becomes separate to whatever it refers. Then the reader is reading many instances of FCT2A as just a string of characters that is somehow important. Reducing TMA (and especially TMUA and TMOA/TMSA) should help avoid both HTR and HTR writing, leaving readers with EC/WM solely for your arguments.
Internet ramblings aside, I do see acronyms being overused. One of my regular comments as a peer reviewer is to remove at least one acronym from the text. No, not to be pedantic or because I have my favourite reviewer 2 comments. I truly find papers that use an excessive amount of acronyms harder to read and harder to follow. I see three broad reasons for using excessive acronyms:
Of course, I’m just an Early Career Researcher2 rambling on my own website. So, of course these thoughts are not prescriptive, nor do I think they apply across all contexts. In the end, the readers are the judges. So, lets be as kind to them as possible.