@Koroke San Did you read the 2 URLs, and could you explain why it's wrong? Good to hear your opinion.
U post 2 URl, i can post 20 URS in which it's recommended to use AV for android. I don't believe in anyone or in their talk untill i don't find it useful for me. I'm talking about real life experience not some PDF experience. mostly peoples say use common sense & download files from safe site like google play store & the fact is some of applications in google play store are infected with malware & some of them are bundled with PUP/Adware which are still unknown. You even don't know ur own that the application u r reading great & nice reviews & getting high rate is actually infected with backdoor/keylogger or trojan or infected with PUP & some common sense people will careless there since they already believe that google play store is safe site 100% & they recommended others to download from safe site like google play store. for example i downloaded some old trusted appreciations from google play store & few of them are bundled with PUP. how can you/me know that the application is infected with pup? it's not like desktop where u can avoid pup via manually unticking crapware during installation, there is no option in android version, simply download & install & u done, invited a PUP or adware in ur clean android. yes ur safe habbit will save u from almost viruses but it's hard to tell which are PUP infected apps. ESET like AV who is good at detecting PUP alerts me that the application i installed is infected with PUP, which helps me. second thing, some peoples who say i didn't have any AV & didn't get infected from XX yrs like they r clapping from themselves for a great achievement, every user habit is different from others. some users for example Mr X who use less surfing ( specially who only surf know sites daily routine), install less application & don't share anything will get less infections compare to others, some are there for example Mr Y who customize his android with various application, habit of collections of android apps , surf most of time( specially some luv to discover new sites, watch porn, online games ect) , habit of sharing via bluetooth, connect his android on other unknown computers/infected one ( like on office, friends even his own), download free applications, download crack applications/games, use insecure wifi,blind trust on his closet friends/unknown person, share his android to his roommate or others,do online banking/shopping <<-- and these peoples get infected much then compare to Mr X .. so wut i want to say it's depend on user habit & u can't change other habits if they don't want to. and some AV companies already discovered new stealth malware/backdoor specially on Chinese one, having AV will protect these users also have some good features like anti-theft, sms/call filter, anti-phishing ( useful for whom who do surf most & do online/shopping banking a lot specially for noobs who don't know wut links they r clicking ), u can get this on freeware AV, no need to pay. some will say AV are resource hog so they don't use it, in such case it's true & in some case it's not, maybe there android r too old for a AV, there battery are getting old & get discharge quickly, there battery capacity is low, there android specification is low or they downloaded a memory consuming AV or some other APP are draining there android & the blame AV.There r some "average users" who will say they use common sense & will tell don't download any keygen,crack & patch & some will leave some comment like 'don't download this torrent, my AV tells it it's a virus" coz they don't aware wut is false positive,but trust me brah i'm a torrent user from many yrs , i did online banking/shopping, didn't get any of my account hack or didn't get infected beside some scenario in which i was totally aware of torrent world, i can tell better which crack/patch & keygen is infected with malware 99/9% then a common sense person. i'm not here actually talking about crack or patch, wut i'm telling that it's not "almost" useless for android wut u r thinking, maybe u don't need coz u don't want but maybe some others want.