I don't think many are accusing Jose of being clueless for going for Perisic. Most have agreed on the reasons why we'd want him. He'd be better than nothing for sure because we can't go into the season without another attacker. However, it is still fair to criticise when you see more talented players like Douglas Costa and James Rodriguez join other clubs. While Jose likely has his reasons for not wanting those players (most likely due to them not being as strong or effective at tracking back), ultimately we need an increase in goals and creativity based on last season. Perhaps it would be better to sacrifice a player's defensive contribution in order to get the best out of a player in terms of his creative output. After all that was one of the main reasons for the fall out between Jose and Ronaldo.
Would it really be better to go for Perisic than Sanchez because Perisic can be relied on to do a better job for the team defensively? I don't believe in this idea that all people who aren't managers should be dismissed as having no idea what they're talking about simply because they haven't applied for any coaching badges. Don't see what the point in even be able to comment is in that case. How much had LVG achieved in his managerial career? Far more than 90% of managers. Does that mean his transfer dealings were right for the club? I'd only say Herrera (who we were already trying to sign) and Martial actually improved the club and he also sold a lot of very talented players that weakened the squad. If you think Perisic is a good enough signing fine but there are legitimate reasons to be concerned with Perisic's relatively average output.