Hi
@AlexyFoxy if this can help you here is my experience. I am on catalina more than 6 months ago.
-Graphics: Good for play videos and browse the Internet (Intel HD Graphics)
-Temps: 40-50 °C with peaks up to 70°C depending on use
-Continuity: it works thanks
@jackluke
-Apps: I don't have any problems with the applications everything works very well, at least for me
-performace: With an SSD 1TB and 16GB of RAM the performance is good or even excellent for an unsupported Mac.
PS: Some web sites with webgl can slow down my mac temporarily but nothing bad
In summary I am very satisfied,
@dosdude1 thank you for reviving my macbook.